Summary of commit:

Chanages:
* README.md:
  - Include commonly used and some custom keybindings
* auto-install.el:
  - Remove .el-get-sources variable
  - Add switch-window
* functions.el:
  - new-file-on-same-window() for creating a new file while staying on same window
  - new-file-on-new-window() for creating a new file and opening the new window
* keybindings.el:
  - Add keybinding for switch-window
  - Add keybinding for new-file-on-same-window
  - Add keybinding for new-file-on-new-window
* required.el:
  - Add switch-window