fix for #788.

Now depth is kept in mind when we inspect chunks in client/server body.
This takes care of FPs originating from inspecting subsequent chunks that
match with depth, but shouldn't.
Update Changelog for 1.4.2
Bump bundled htp version to 0.2.13
Merge branch 'master-1.4.x' of git://phalanx.openinfosecfoundation.org/oisf into master-1.4.x-cyos