Blair Vanderhoof ac94a7fe77 Escape URL string before creating an NSURL
Summary:
If we make a request that contains a pipe character, URLWithString will return null.  This fix escapes these and other characters before creating the NSURL.
Closes https://github.com/facebook/react-native/pull/786
Github Author: Blair Vanderhoof <blairv@gmail.com>

Test Plan: Imported from GitHub, without a `Test Plan:` line.
2015-04-12 10:17:16 -08:00
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