SRADA-890: Implemented local DA settings loading

SRADA-890: Implemented local DA settings loading

Needed to load configuration files from product instead of Tizen SDK.

Changes:
 * Implemented PathManager.getConfigDir() static method
 * Added PathConstants.TEMP_SETTINGS_FOLDER_NAME static value
 * Added Apache Commons-IO library to plugin's dependencies
 * Added 'temp' to .gitignore

Note: when running within Eclipse IDE DA will copy default setting files from
      product resources to 'temp' directory in DA sources.

Change-Id: I20b6a7d5f707aa05d72957ac42d1f0eb18cc68b4