Adds Sp_Api::getMobileApps() and getMobileAppPhotos() methods.
Issue #2721: Added Sp_Api::getMobileApps() $page default parameter.
Issue #2721: Passing page number through to request on getMobileApps().
Merge pull request #5 from bdeshong/mobile-app-support

Adds supporting methods for new Mobile App API methods.
Don't force SSLv3 unless the SHOOTPROOF_FORCE_SSLV3 envvar is set
Catch CURL errors and use custom exceptions for different error types
Fix whitespace
Fixed several bugs in the OAuth example
Use CURLFile instead of `@` syntax

Fixes a deprecation error on later PHP versions.