Added function to map error strings to enum values.
Fixed account error string mapping function, added authorization error string mapping function and error strings.
Merge remote-tracking branch 'origin/develop' into feature/12_error_strings

Conflicts:
	src/twitter_authorization.h
Merge remote-tracking branch 'origin/develop' into feature/12_error_strings
Adding error strings for twitter_api.
Added twitterAPIErrorDescription.
More error strings and some cleanup.
Small fixes for error strings.
Merge pull request #21 from chead/feature/12_error_strings

Feature/12 error strings