Add .editorconfig file.
Modify grunt tasks.

- Append test task to run jasmine_node.
- Append default task to run jshint and test.
Fix coding style's problem.
Fix custom config setting's documents.
Add environment settings support.

export GRUNT_CORDOVA_NG_PLATFORMS=ios,android
export GRUNT_CORDOVA_NG_BUILD=debug
export GRUNT_CORDOVA_NG_DEVICE=emulator
export GRUNT_CORDOVA_NG_TARGET=target1
Referctoring.
Append document about environment varable's settings.