Update build.gradle to more closely match CC:T's

- Adds cct-javadoc fun and renables checkstyle (yay?)
 - Fixes a few javadoc and formatting issues
 - Cherry pick the docs so illuaminate doesn't complain

doc/stub/turtle.lua

@@ -0,0 +1,14 @@
+--[[- Craft a recipe based on the turtle's inventory.
+
+The turtle's inventory should set up like a crafting grid. For instance, to
+craft sticks, slots 1 and 5 should contain planks. _All_ other slots should be
+empty, including those outside the crafting "grid".
+
+@tparam[opt=64] number limit The maximum number of crafting steps to run.
+@throws When limit is less than 1 or greater than 64.
+@treturn[1] true If crafting succeeds.
+@treturn[2] false If crafting fails.
+@treturn string A string describing why crafting failed.
+@since 1.4
+]]
+function craft(limit) end