Fix failing tests for users w/o access to the ACCOUNT_PASSWORD env variable. Disable e2e public network tests in Travis pull requests. Exclude lib dir from unit tests.
* Accounts are now encrypted with a strong passphrase.
* The encrypted passphrase is stored in .travis.yml
* Public testnet tests are now run after tests on a private net
Evgeny Danilenko
perissology
Adam Babik
Victor Farazdagi