add gitignore file for ignore all opencart and vqmod files

since we need to add opencart and vqmod files to the folder in order to
have OT working, we need a ignore file to avoid keep track of OC and
vqmod files
fix for vqmod duplicated replace
removed cache load from product model
fix for #2 multi store issue
Create README.md

added install and upgrade instructions
change version to 1.2.1
change branching model

Change branching model to follow the model described here
http://nvie.com/posts/a-successful-git-branching-model/
update readme

add link to semantic versioning 2.0.0 http://semver.org
Bumped version number to 1.2.2
fix for overlaying panels issue
fix for ignore files to add empty folder to repo
Merge branch 'hotfix-1.2.2'
Merge branch 'hotfix-1.2.2' into develop
Bumped version number to 1.2.3
fix for #3 Undefined variable: text_sizes in product page
Merge pull request #4 from adamjm7/master

Wrong url return from admin product controller
Wrong url return from admin product controller (adamjm7)

When filtering by printable status, the url returned was incorrect.

Multiple lines contain
'$filter_printable=' . $this->request->get['filter_printable'];

It should be
'&filter_printable=' . $this->request->get['filter_printable'];
Merge branch 'hotfix-1.2.3'
Merge branch 'master' of https://github.com/opentshirts/opentshirts
Bumped version number to 1.2.4