added test project for the social network clients
social network clients classes renamed to unify class prefix in project
pod file added
client method signatures changed, added new methods
fb client refactored, added new client methods (profile and friends)
ui changes and fb client requests added
pod file updated, added category pod
oath logic extracted to its own subclass of the snclient
several method definitions changed to unify with other modules
json request operation wrapper added for signatures requests
twitter client now uses generic oauth client
linkedin client implementation added
twitter and linkedin examples added
vk and myspace are removed for now
app delegate cleaned
fb client caching keys string exported as const strings