More tidying up, added category to invoices, invoice delete now deletes invoice, pyaments, history and items associated with invoice. Exclude Cancelled invoice under dashboard income recieveables

vendor/otphp-10.0/.github/CONTRIBUTING.md

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+# Contributing
+
+First of all, **thank you** for contributing.
+
+Bugs or feature requests can be posted online on the GitHub issues section of the project.
+
+Few rules to ease code reviews and merges:
+
+- You MUST follow the [PSR-1](http://www.php-fig.org/psr/psr-1/), [PSR-2](http://www.php-fig.org/psr/psr-2/) and [PSR-4](http://www.php-fig.org/psr/psr-4/) coding standards.
+- You MUST run the test suite.
+- You MUST write (or update) unit tests when bugs are fixed or features are added.
+- You SHOULD write documentation.
+
+We use [Git-Flow](http://jeffkreeftmeijer.com/2010/why-arent-you-using-git-flow/) to automate our git branching workflow.
+
+To contribute use [Pull Requests](https://help.github.com/articles/using-pull-requests), please, write commit messages that make sense, and rebase your branch before submitting your PR.
+
+May be asked to squash your commits too. This is used to "clean" your Pull Request before merging it, avoiding commits such as fix tests, fix 2, fix 3, etc.
+
+Run test suite
+------------
+
+* install composer: `curl -s http://getcomposer.org/installer | php`
+* install dependencies: `php composer.phar install`
+* run tests: `vendor/bin/phpunit`