add F2 shortcut for renaming project

[yanxyz]

呃，main.less 的改动看着有点多，我的编辑器保存时自动去掉行未空白:-)，实际只加了一句 outline: none。另外没有编译为 css。

[oklai]

@yanxyz Thanks.
But now can not be directly merger into the master branch, I plan to use a new git branching model, I will create a new "develop" branch, then we will work on the develop branch. Please reference here: A successful Git branching model. I will do this next week. Btw, Please use English to explain your pull request so that others can understand.

Cheers.