Move epgsql deps dir to match rebar location

[spiegela]

Related to #112. Despite the fix that @jfacorro applied, I still am unable to get it to compile with Rebar.

The issue is related to the dependency directory: Rebar clones the epgsql dependency into deps/epgsql/... and sumo expecting it in deps/pgsql/... I haven't found a way to configure this in Rebar, so I've changed the dependency name to epgsql, configured it in the Makefile and updated sumo_store_pgsql.erl to match. I tested with make & Rebar -- both appear to work.

[elbrujohalcon]

This looks good, I'll wait for @jfacorro to review it anyway, but just in case you need this later: to change the name of the dep dir in rebar you just need to rename your dep, i.e. from…

{epgsql,      ".*",  {git, "git://github.com/epgsql/epgsql",              "2.0.0"}},

…to…

{pgsql,      ".*",  {git, "git://github.com/epgsql/epgsql",              "2.0.0"}},

[spiegela]

@elbrujohalcon Thanks! I thought the something about the rebar config, had tried to change make the change you suggested, but got an error from Rebar when running get-deps:

Pulling pgsql from {git,"git://github.com/epgsql/epgsql","2.0.0"}
Cloning into 'pgsql'...
WARN:  /Users/spiegela/src/dist/spiegela-sumo_db/deps/pgsql/src/epgsql.app.src has application id epgsql; expected pgsql
ERROR: Dependency dir /Users/spiegela/src/dist/spiegela-sumo_db/deps/pgsql failed application validation with reason:
{name_mismatch,{"/Users/spiegela/src/dist/spiegela-sumo_db/deps/pgsql/src/epgsql.app.src",
                {expected,pgsql},
                {has,epgsql}}}.
ERROR: 'get-deps' failed while processing /Users/spiegela/src/dist/spiegela-sumo_db: rebar_abort

[elbrujohalcon]

oh, man! You're right… so… it seems there is no way to achieve that in rebar. That's odd.