Merge pull request #17 from bachand/master

Update to podspec so that localized resources are correctly pulled in for CocoaPods installation
Updating podspec to implement preserve_paths
Modified gitignore to ignore more unnecessary files
Merge branch 'master' of github.com:ustwo/US2FormValidator
Modified code to used style guide
Added email condition test to fix issue #15

Fixes https://github.com/ustwo/US2FormValidator/issues/15
fix violation string for alphabetic condition
Merge pull request #19 from yakubbaev/master

fixed violation string for alphabetic condition
Update US2FormValidationFramework/source/base/US2Condition.h

fix misleading comment
Merge pull request #20 from yakubbaev/patch-2

Update US2FormValidationFramework/source/base/US2Condition.h
Removing US2ConditionEmpty and US2ValidatorEmpty for #18

Adding US2ConditionPresent and US2ValidatorPresent classes
Updating strings files to handle new key 'US2KeyConditionViolationPresent'
Updating documentation
Supressing computer warning
Merge branch 'development'
Updating podspec
Additional changes related to removing US2ConditionEmpty and US2ValidatorEmpty

Updated a few comments as well as the main header file to use the new
condition/validator.