Add Customizations!!! :heart:
Fix typo bug.
Update manuals.
Add Customizations!!! :heart:
Correct installation guide.
Add some details in README.md.
Avoid unnecessary load-theme and screen flashing when changing color of
mode-line or Powerline.
Improve some faces. Fix wrong #000000 faces under terminal.
1. Reset all font size to 1.0
2. Some others.