Fix table of content.
Add microrb.com.

> micro.rb aims at gathering small well focused ruby libraries,
> that do one thing and do it well. We are concerned about focus and clarity.
> Other metrics such as the number of dependencies and the lines of code also
> matter.
Merge pull request #18 from JuanitoFatas/doc/patch-1

Fix table of content.
Merge pull request #19 from JuanitoFatas/doc/patch-2

Add microrb.com.
Merge remote-tracking branch 'upstream/master'
Added gems for e-commerce
Merge pull request #20 from katgironpe/master

Added gems for e-commerce
Added Houston for push notifications
Merge pull request #21 from katgironpe/master

Added Houston for push notifications
Added Editor Plugins
Add Rroonga
Merge pull request #22 from ongaeshi/master

Add Rroonga
Merge remote-tracking branch 'upstream/master'
Added sunspot and bourbon
Merge pull request #23 from katgironpe/master

Added sunspot and bourbon
Merge remote-tracking branch 'upstream/master'
Some contribs v9...