Fixed closing div element in admin footer.tpl

Closes #1394
Fixed closing p tag surrounding the powered by in catalog/view/theme/default/template/common/footer.tpl
Applied suggested patch for system/library/language.php to default to English and merge additional language.

REF: #1366
Additional standards improvements.
Updated spaces to tabs.
More space indent fixes.
a few fixes
Merge branch 'master' of https://github.com/opencart/opencart
Changed standards on build server.

Added weights to code sniffer finds.

Added more checks.

Updated more files to ensure tabs not spaces are used.
Edited startup.php to remove the exit() statement; Removed the error handler from tests; Added tests for Customer and Order models in catalog.
Merge branch 'master' of https://github.com/opencart/opencart into opencart/2.0-testing-suite
fix in the checkout/OrderTest.php .
Moved the unit tests into /tests/phpunit folder; Started working on tests for account/address model.
Merge pull request #1400 from Martynas-P/2.0-testing-suite

moved unit tests, added additional ones