Update vimrc after reading Practical Vim

* Removed python-mode plugin, it is too slow.
* Add vim-unimpaired plugin.
* Removed vim-Buffergator plugin.
* Remapped \ to , to fix reverse search.
* Added mapping ",n" and ",N" for centering line in forward search.
* Commented out completeopt because they were messing with supertab.
* Fixed tab completion in the wildmenu.
* Set expandtab
* Remove smartindent
* Set tabstop
* Add map ",w" for opening links in the browser.
* Add map ",y" for coping all text in the buffer.
* Added mapping for ZoomWin and Tagbar
* Changed mappings j and k to work on display lines instead of real lines.
* Added function keymap section.
* Moved file autocmds to ~/.vim/ftplugin
* Fixed python pep8 indent
Add new color schemes
Add new python snippet for pprint
Add new plugins
Change date format in rst.snippet
Add file extensions to wildignore
Change theme to molokai
Update all mappings
Start using vim-markdown again
Start using gundo
Change EasyMotion and CtrlP settings
Update go snippets
Update python snippets
Add spellfile config
Add gocode code completion support
Readd bufexplorer to plugins
Disable wrapping
Change to fold on marker
Update function key mappings