Adds a new 50 - 50 snippet. Changes tab stops to acomodate the optional gutters class in most grid snippets
Merge branch 'develop' of github.com:pedrocorreia/sublime-ink into develop

Signed-off-by: Pedro Correia <pedro.a.correia@co.sapo.pt>

Conflicts:
	Grid/20-80-columns.sublime-snippet
	Grid/25-75-columns.sublime-snippet
	Grid/30-70-columns.sublime-snippet
	Grid/33-66-columns.sublime-snippet
	Grid/40-60-columns.sublime-snippet
	Grid/60-40-columns.sublime-snippet
	Grid/66-33-columns.sublime-snippet
	Grid/70-30-columns.sublime-snippet
	Grid/75-25-columns.sublime-snippet
	Grid/80-20-columns.sublime-snippet