Move configuration to .gitconfig

Use git config to set/get the checkout directory of git stoq,
instead of saving it in a separate file location.

Change-Id: I516d05cd3c599a3c4cd8e3f58de4061ca3762ace
Export STOQ* environment variables first

By exporting STOQ* variables first, one can use/modify them inside their
~./bashrc. We can't do that with PATH because it's very common for bashrc to
modify PATH, and that can lead to problems.

Change-Id: I73ecc800cd68a7c03ca69490db873dd3981f54ce
Use wget instead of curl

curl may not be installed on system, while wget for sure is
(e.g. On an Debian 6.0/Ubuntu 12.04 installation, curl isn't installed by
default, and neither on other distros AFAIK)

Change-Id: I8fccd24645f981ab8d51327476ab02822a5ce2fd
Compile translations for all projects on checkout

Instead of just compiling translations for stoq/kiwi/stoqdrivers, do that for
all projects on checkout dir that have a "po/pt_BR.po" file. Also, optimize it
to just compile the translations if the .po is newer than the .mo

We can do it on the script instead on the rc file since we are not using kiwi
anymore (msgfmt isn't on the custom PATH we set), so put it together with git
hooks processing.

Change-Id: I1163607804372a42c8629ea96eebadd6e0e204e0
Use github URL for repo manifest

Get the repo manifest from github for improved reliability and speed.
This needs the github changes on the stoq-manifest repository, or else it will
break things.

Change-Id: I82905b99562a9ead3a3b7369811f8f035a4bff05
Use the new stoq/tools/env.sh instead of _shell

_shell was moved to stoq/tools/env.sh. Use it instead of keeping the
duplicated code.

Change-Id: I3f864b9ee091c694e02c21feaddc8add5954da47
Modify git-stoq to do not use gerrit