Use new dev-lib

[JDGrimes]

See WordPoints/dev-lib#2

We may want to integrate this with the dev-lib from xwp that we currently use, or just use them both separately.

[JDGrimes]

The only issue is that there is a failure on WordPress nightly:

https://travis-ci.org/WordPoints/wordpoints/jobs/50124821#L1663

There was 1 failure:

1) WordPoints_Points_1_5_1_Update_Test::test_db_table_charsets_updated

Failed asserting that 'CREATE TABLE `wptests_wordpoints_points_logs` (

`id` bigint(20) NOT NULL AUTO_INCREMENT,

`user_id` bigint(20) NOT NULL,

`log_type` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL,

`points` bigint(20) NOT NULL,

`points_type` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL,

`text` longtext COLLATE utf8mb4_unicode_ci,

`blog_id` smallint(5) unsigned NOT NULL,

`site_id` smallint(5) unsigned NOT NULL,

`date` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',

PRIMARY KEY (`id`),

KEY `user_id` (`user_id`),

KEY `points_type` (`points_type`(191)),

KEY `log_type` (`log_type`(191))

) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci' ends with "DEFAULT CHARSET=utf8".

/home/travis/build/WordPoints/wordpoints/tests/phpunit/tests/points/update/1-5-1.php:74

FAILURES!

Tests: 344, Assertions: 770, Failures: 1, Incomplete: 1, Skipped: 25.

The command "phpunit-basic" exited with 1.

[JDGrimes]

Fixed.