Resolved bug 746

Added verification that path param is starting with with '/'.
Resolved issue with incorrect code for '/' auto-stripping.

Param path should start with '/'. We could not have default
value for this param as '/' by few reasons:

   1)We could not declare default value for this param
     syntacticaly/semanticaly

   2)When user is working with services he should
     exactly know what he is doing. And making path
     parameter default value to '/'  going to hide some
     implementation details and also (what is very important)
     form incorrect impression about API behaviour.

Change-Id: I23aa0a0bb98211bc29c70cc0bf0cc26d924de1c2