add number parsing failover for subscriberCellularProvider == nil

add failover to the convenience method parseWithPhoneCarrierRegion:error: in NBPhoneNumberUtil.m to handle cases where subscriberCellularProvider == nil
Merge pull request #12 from toblerpwn/master

add number parsing failover for cases where device's subscriberCellularProvider == nil (e.g. iPad)
Update libPhoneNumber-iOS.podspec

include recent fixes in podspec (April 2014 - June 2014)
Merge pull request #14 from toblerpwn/master

Update libPhoneNumber-iOS.podspec [MAINTAINER MUST CREATE GIT TAG]
Update README.md
Update README.md
repeat changes from e4b3a5c001f63bb809519cf2c7f326fa72a77c16

repeat changes from e4b3a5c001f63bb809519cf2c7f326fa72a77c16

old commit was in the following file:

libPhoneNumber-iOS/NBPhoneNumberUtil.m

this commit is in a duplicate file in a sibling directory:

libPhoneNumber/NBPhoneNumberUtil.m
Merge pull request #16 from toblerpwn/master

Previous commits not taking effect when downloaded via Cocoapods
Remove duplicates
Fix plist path
Update README.md
Update README.md
Update README.md
only use CoreTelephony when running on iOS
add support for OS X
Merge pull request #17 from fawkeswei/master

Add support for OS X
Add NSCoding to NBPhoneNumber and etc.
improve performance by ~70% when parsing large numbers of phone numbers (e.g. parsing the phone numbers of an entire contact list)
Merge pull request #19 from evilstudios/master

improve performance by ~70% when parsing large sets of phone numbers
improve performance in hasValue: method of NBPhoneNumberUtil