Add main module file, and administration functions
Set version to 1.0.0-alpha
Add a constants file
Add the 'update_wordpoints_modules' cap on install

Also, remove it on uninstall.

Closes #2
Squashed 'tests/phpunit/library/plugin-uninstall/' content from commit 9bd47a5

git-subtree-dir: tests/phpunit/library/plugin-uninstall
git-subtree-split: 9bd47a53decc8afef8eae09996e418e70e0d067d
Merge commit 'e380c903896249438bc6bf40019203d14c329680' as 'tests/phpunit/library/plugin-uninstall'
Squashed 'tests/phpunit/library/module-uninstall/' content from commit 83cd6a6

git-subtree-dir: tests/phpunit/library/module-uninstall
git-subtree-split: 83cd6a65b2912d672199aa02932bec37505c484b
Merge commit 'c8a4f0123f9e959784efd2c65ba441452ab09f1b' as 'tests/phpunit/library/module-uninstall'
Add uninstall unit tests