added xctool in reqs sections
basic cleanup of main script
renamed main script
updated README
fixed build command syntax help string
added install command
install improvement
- moved constants to separate file
- added class for accessing system config
changed sys config prop name for android's project additional properties
code clearings
fixed gen_keystore method
return all configs as Hashr instances
added rake task for generating keystore
store keystore related data into props file
renamed sysconf value android.project_properties_file to android.properties_file
clarified var names
add data to config file only after successful keystore generation
updated installation instruction in README
simplified keystore generation task to accept only two params: app_name and password
added methods to retrieve hashes from android keystores