Unit tests for android_sdk and AndroidProject (#464)

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### Platforms affected
Android

### What does this PR do?
This is the last unit test PR for today, I promise! The `AndroidProject` tests were originally in #458. This PR also contains increased test coverage for `android_sdk.js`. I have also refactored that to remove `Q`, as with the other PRs I submitted today.

### What testing has been done on this change?
Run unit tests

### Checklist
- [x] [Reported an issue](http://cordova.apache.org/contribute/issues.html) in the JIRA database
- [x] Commit message follows the format: "CB-3232: (android) Fix bug with resolving file paths", where CB-xxxx is the JIRA ID & "android" is the platform affected.
- [x] Added automated test coverage as appropriate for this change.

bin/templates/cordova/lib/android_sdk.js

@@ -17,7 +17,6 @@
        under the License.
 */
 
-var Q = require('q');
 var superspawn = require('cordova-common').superspawn;
 
 var suffix_number_regex = /(\d+)$/;
@@ -95,7 +94,7 @@ module.exports.list_targets = function () {
         } else throw err;
     }).then(function (targets) {
         if (targets.length === 0) {
-            return Q.reject(new Error('No android targets (SDKs) installed!'));
+            return Promise.reject(new Error('No android targets (SDKs) installed!'));
         }
         return targets;
     });