add Front-end Developer Interview Questions
Minor fixes.
Add GIMP.
Add some editors and IDEs.
Add some debugging tools.
Add some tools/websites about VCS/SCM.
Trivial fixes.
Add some books.
Some minor addition.
Merge pull request #77 from Kaijun/master

add Front-end Developer Interview
More fixes.
Merge pull request #79 from xfq/master

Update README