Try to set code path on Wrangler start

First wait until the distel module is loaded, so we're sure we can
make RPC calls.  Then try to find an ebin directory containing
wrangler.app.
Merge pull request #45 from legoscia/set-code-path

Try to set code path on Wrangler start
bug/type fixes.
Merge branch 'master' of github.com:RefactoringTools/wrangler
changed caller_funs to calls_to_fun in the CMD message.
fix in function search_and_transform_1/3.
fixed unification with guard exprs.
fixed problem with expanding meta-if-expr.
merged from wrangler_ws.
removed diff line.
added how-to-use info for new refactorings.
changed version number to 1.1.
changed version to 1.1
bug fix
I got the make error: src/refac_s_group.erl:3: can't find include lib "wrangler/include/wrangler.hrl"
Merge pull request #49 from dmitrii-zolotarev/master

I got the make error: src/refac_s_group.erl:3: can't find include lib "w...
fixed include.
fixed include path.
bugfix when checking meta clauses.
Updated: list of modules in ebin/wrangler.app file (fixes: rebar complains when Wrangler is added as a dependency in other projects).