[config] Moved window resize to startify plugin config

Change-Id: I503f1c77cf6a68da016c26cf1d641b1449d65837
[config] Improved SetupWindow to detect empty  buffer

Change-Id: Ida4a464c46beebb6c3d231bcb095bf54d12ca56f
[plugin] A added vim-snippets plugin

Change-Id: Id041a763b681dcf3b3a7c040c806109c446e2cfc
[plugin] UltiSnip further setup  and documentation

Change-Id: Ic3e6e11b40d6519bdade388dec75a3b922a8854b