Clarify Inventory.contains(ItemStack, amount) and add @see

... to containsAtLeast(ItemStack, amount) as well as a slight wording change to containsAtLeast.
Slightly better wording for contains()
Reword on containsAtLeast()
Fix second lines, add p-tag
Fix capitalization
Merge #39

commit 882d75593fa2d706f1d75578d4597a4b4df150bb
Author: riking
Date:   2013-09-01 17:18:45 -0700

Fix capitalization

commit 7981c0e4a1998b6eadd554a7bb478eec75810ec4
Author: riking
Date:   2013-09-01 15:52:34 -0700

Fix second lines, add p-tag

commit 984651238472439e64b78c95e7da31f72ac6dcc8
Author: riking
Date:   2013-09-01 11:44:34 -0700

Reword on containsAtLeast()

commit 384999e8aba60bee2cc47808d22a381582ace34a
Author: riking
Date:   2013-09-01 11:41:11 -0700

Slightly better wording for contains()

commit 5b1b472f00df54a4339e2677add057b45eca3dd9
Author: riking
Date:   2013-09-01 11:29:17 -0700

Clarify Inventory.contains(ItemStack, amount) and add @see

... to containsAtLeast(ItemStack, amount) as well as a slight wording change to containsAtLeast.
Clean up #39