CB-6963. Port media tests to plugin-test-framework

Ported media test form mobilespec to the new test-framework in jasmine
2.0
Added test folder
Added tests.js file inside the test folder.
CB-6963 Port Media manual & automated tests

Ported 17 Media automated & manual tests from mobilespec.

This commit adds the work done by javierbb31

Jasmine version: ported from v1.3 to v2.0

Features(automated tests):
-No spies.
-Tests failing faster, when a error callback or unexpected success
callback is received, the test fails immediately.
-Jasmine report with more information about the failed operation, which
contains the operation and a description about it.
-Jasmine reports include error callback object.
-Two timeout statement to just wait until the a media file is
reproduced, there are no more timeouts than those.
-Added a control variable to ensure that a callback is reached only
once.

Bugs:
There are two bugs reported as direct result of this porting activity.

CB-7092

https://github.com/martincgg/cordova-plugin-media/blob/9fab60a8a3de2b68cb96fdcdd36cbdbfff73ce8e/test/tests.js#L158

This one it's about a conditional added in case that the platform is
windows phone, on that platform it has an unexpected behavior at the
error callback. If the platform is windows phone the test is going to
fail, until the bug is fixed, this specific problem causes a mess with
the rest of the test.
All details related to this:
https://issues.apache.org/jira/browse/CB-7092

CB-7099

https://github.com/martincgg/cordova-plugin-media/blob/9fab60a8a3de2b68cb96fdcdd36cbdbfff73ce8e/test/tests.js#L188

https://github.com/martincgg/cordova-plugin-media/blob/9fab60a8a3de2b68cb96fdcdd36cbdbfff73ce8e/test/tests.js#L215
CB-6963 renamed folder to tests + added nested plugin.xml
Merge branch 'CB-6963' of https://github.com/martincgg/cordova-plugin-media