TOC Depth filter function added

Add options to TOC to only show selected depth of titles ; ie pass 1,3
arguments to only show titles depth 1 to titles depth 3
Plus now you can have two+ TOC on your document, each different
Re-indent with spaces TOC Depth filter

Travis said spaces, not tab. Meh.
Merge branch 'master' of https://github.com/Pyreweb/PHPWord into #189-pyreweb
Merge remote-tracking branch 'upstream/develop' into #189-pyreweb