Added default mapping toggle, as well as <Plug>s

Default mappings can now be toggled off with
g:interestingWordsDefaultMappings = 0

Mappings now show the <Plug> interface.
Merge branch 'master' of https://github.com/vasconcelloslf/vim-interestingwords

Conflicts:
	plugin/interestingwords.vim
Merge pull request #11 from Dissonant-Tech/master

Added default mapping toggle, as well as <Plug> interface for key mappings