CB-12002 - Add getAllowIntents() to ConfigParser

[dpogue]

Platforms affected

None, but I'm adding this as preparation for an iOS feature.

What does this PR do?

Adds a convenience method to retrieve the list of <allow-intent> tags from config.xml, similar to the getAllowNavigations() and getAccesses() methods.

What testing has been done on this change?

Additions to the existing spec tests.

Checklist

• Reported an issue in the JIRA database: CB-12002
• Commit message follows the format
• Added automated test coverage as appropriate for this change.

[shazron]

Let's try to get this in for the cordova-common release for cordova-ios 4.3.0 release

[codecov-io]

Current coverage is 80.40% (diff: 100%)

Merging #502 into master will not change coverage

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  Files            67         67          
  Lines          5189       5189          
  Methods         836        836          
  Messages          0          0          
  Branches       1005       1005          
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  Hits           4172       4172          
  Misses         1017       1017          
  Partials          0          0          

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