Vim experimental modules should be short-lived and really used for
experimentation, not be always in git and messing up diffs.
An initial foldlevel of 2 has been added to vim, this is experimental
and if it doesn't suit me can be easily reverted.
Setting everything during PlugLoad function caused some plugins to
misbehave. Plugins are now loaded by Plug and their settings can be
either set with a file in the plugin directory (this mimicks the old way
of setting plugin up during load) or in after/ directory, which sets
options *after* everything has loaded.
