[WIP] Developing 3.1.0

[kohkimakimoto]

Rebuild using laravel (Illuminate) components.

This PR includes a lot of changes. I'm considering to release this branch to v4.0.0

Design and implementation NOTE:

• RuntimeTask class is too complex class (including a lot of dependences). At now, it has methods to do almost anything in a user defined task. For instance:$task->exec() ,$task->writeln(), $task->call(). So, I want to divide this class to some classes.
• $task->exec() is deprecated. I'm making new syntax. for instance Process::exec() that refers to laravel facades.
• $task->writeln() is deprecated. I'm making Output::writeln().

[coveralls]

Coverage remained the same when pulling ed613ab on 3.1.x into b03b54a on master.

[coveralls]

Coverage remained the same when pulling 6666fb1 on 3.1.x into b03b54a on master.

[coveralls]

Coverage remained the same when pulling 352ab47 on 3.1.x into b03b54a on master.

[coveralls]

Coverage remained the same when pulling 552f914 on 3.1.x into b03b54a on master.

[coveralls]

Coverage decreased (-33.86%) when pulling 81f4d72 on 3.1.x into b03b54a on master.

[coveralls]

Coverage decreased (-37.36%) when pulling 3f69bcf on 3.1.x into b03b54a on master.

[coveralls]

Coverage decreased (-37.36%) when pulling 4a3bb4f on 3.1.x into b03b54a on master.

[coveralls]

Coverage decreased (-37.42%) when pulling 62231e6 on 3.1.x into b03b54a on master.

[coveralls]

Coverage decreased (-42.89%) when pulling e6003b5 on 3.1.x into b03b54a on master.

[coveralls]

Coverage decreased (-43.59%) when pulling ebaf431 on 3.1.x into b03b54a on master.

[coveralls]

Coverage decreased (-50.99%) when pulling 48b78d9 on 3.1.x into b03b54a on master.

[coveralls]

Coverage decreased (-44.05%) when pulling 4d9fc21 on 3.1.x into b03b54a on master.

[coveralls]

Coverage decreased (-35.98%) when pulling 9a71c29 on 3.1.x into b03b54a on master.

[coveralls]

Coverage decreased (-37.84%) when pulling 573fdc9 on 3.1.x into b03b54a on master.

[kohkimakimoto]

This WIP PR moved to branch 4.0