docs(@embark/site): improve documentation on global test function

Add docs for mineAtTimestamp and getEvmVersion and improve the
other ones a bit (typos, format, etc)

site/source/docs/contracts_testing.md

@@ -248,7 +248,7 @@ contract('SimpleStorage Deploy', () => {
 Using `assert.reverts`, you can easily assert that your transaction reverts.
 
 ```javascript
-await assert.reverts(contractMethodAndArguments[, options][, message])
+await assert.reverts(contractMethodAndArguments[, options][, message]);
 ```
 
 - `contractMethodAndArguments`: [Function] Contract method to call `send` on, including the arguments
@@ -259,9 +259,9 @@ Returns a promise that you can wait for with `await`.
 
 ```javascript
 it("should revert with a value lower than 5", async function() {
-    await assert.reverts(SimpleStorage.methods.setHigher5(2), {from: web3.eth.defaultAccount},
-      'Returned error: VM Exception while processing transaction: revert Value needs to be higher than 5');
-  });
+  await assert.reverts(SimpleStorage.methods.setHigher5(2), {from: web3.eth.defaultAccount},
+    'Returned error: VM Exception while processing transaction: revert Value needs to be higher than 5');
+});
 ```
 
 ### assert.eventEmitted
@@ -269,10 +269,10 @@ it("should revert with a value lower than 5", async function() {
 Using `eventEmitted`, you can assert that a transaction has emitted an event. You can also check for the returned values.
 
 ```javascript
-assert.eventEmitted(transaction, event[, values])
+assert.eventEmitted(transaction, event[, values]);
 ```
 
-- `transaction`: [Object] Transaction object returns by a `send` call
+- `transaction`: [Object] Transaction object returned by a `send` call
 - `event`: [String] Name of the event being emitted
 - `values`: [Array or Object] Optional array or object of the returned values of the event.
     - Using array: The order of the values put in the array need to match the order in which the values are returned by the event
@@ -280,8 +280,8 @@ assert.eventEmitted(transaction, event[, values])
 
 ```javascript
 it('asserts that the event was triggered', async function() {
- const transaction = await SimpleStorage.methods.set(100).send();
- assert.eventEmitted(transaction, 'EventOnSet', {value: "100", success: true});
+  const transaction = await SimpleStorage.methods.set(100).send();
+  assert.eventEmitted(transaction, 'EventOnSet', {value: "100", success: true});
 });
 ```
 
@@ -297,12 +297,34 @@ await increaseTime(amount);
 
 ```javascript
 it("should have expired after increasing time", async function () {
-    await increaseTime(5001);
-    const isExpired = await Expiration.methods.isExpired().call();
-    assert.strictEqual(isExpired, true);
+  await increaseTime(5001);
+  const isExpired = await Expiration.methods.isExpired().call();
+  assert.strictEqual(isExpired, true);
 });
 ```
 
+### mineAtTimestamp
+
+This function mines a block and sets its `block.timestamp` accordingly. It let's you mine in the future.
+
+```javascript
+await mineAtTimestamp(timestamp);
+```
+
+`timestamp`: [Number] Timestamp when to mine the block
+
+### getEvmVersion
+
+`getEvmVersion` returns the version and type of EVM.
+
+It is useful if you want to make sure the EVM has the sufficient version to support an RPC call or if you want to make sure that you are using a VM like Ganache-CLI before making a call that only a VM supports.
+
+```javascript
+await getEvmVersion();
+```
+
+Returns a string, eg: `EthereumJS TestRPC/v2.9.2/ethereum-js`
+
 ## Code coverage
 
 Embark allows you to generate a coverage report for your Solidity Smart Contracts by passing the `--coverage` option on the `embark test` command.