updated tests

updated docs
added tests for is-in-polygon
added tests for is-in-polygon
issue #1090: added `make superclean` to docs
issue #1083: do not show just 7 document attributes
Added the hint that homebrew also needs to be updated
updated documentation and operators behavior
added PERCENTILE function, draft
Merge branch 'devel' of https://github.com/triAGENS/ArangoDB into devel
remove superfluous threads after a grace period
fixed crash when accessing _from or _to of non-edges
added "split-filters" rule but did not activate it
issue #1095: non-kaputtbar
Merge branch 'devel' of ssh://github.com/triAGENS/ArangoDB into aql-feature-lazy-index
Merge branch 'aql-feature-lazy-index' of ssh://github.com/triAGENS/ArangoDB into aql-feature-lazy-index
cleaning up, using ReverseOperator.
applying isConstant patch
fixing test.
lazy index working for skiplists
cleaning up