* Refactor Counter to support increment and decrement.
* Move Counter out of drafts.
* Refactor ERC721 to use Counter.
* Rollback Counter returning the current value in increment and decrement.
* Update test/drafts/Counter.test.js
Co-Authored-By: nventuro <nicolas.venturo@gmail.com>
* Improve Counter documentation.
* Move Counter.test to utils.
* Move back Counter to drafts.
* Now compiling in a separate directory using truffle 5.
* Ported to 0.5.1, now compiling using 0.5.1.
* test now also compiles using the truffle 5 hack.
* Downgraded to 0.5.0.
* Sorted scripts.
* Cleaned up the compile script a bit.
* rename Index.currentId to current
* use += operator for clarity
* rename Counter.Index to Counter.Counter
* move Counter to drafts
(cherry picked from commit 3e55408cb5)