* typo in Algorithm::addParam for 'short' data type which results in segmentation fault on ARM
  on attempt to set type property for FAST using setter inherited from Algorithm
* added short type support to read/write methods
* improved some error messages

Some unification done to simplify camera switching.

Some code refactoring done.

Rair hangs on library installation fixed.

made it to give more verbose errors when arguments of wrong types are passed, added setters with types (e.g. setInt, etc)

Frame format setter added to both views.

Old Android support added;
Android 4.1.x fixes added;
Thead sync added;
Camera errors handling added.