Forwards compatibility with zend-servicemanager v3

[weierophinney]

This patch reverts some of the changes from #5 in favor of making the component forwards compatible with v3. Specifically:

• Updates dependencies to known-stable, forwards compatible versions where possible, with the following specific changes:
  • Updated zend-stdlib to ^2.7 || ^3.0
  • Updated zend-servicemanager to ^2.7.5 || ^3.0.3
  • Removed zend-modulemanager (not used)
• Updates the test matrix to specify the version of zend-servicemanager to use, and to test each version against each PHP version in the matrix. For tests against the zend-servicemanager v3 series, zend-mvc is removed from the dependencies.
• Updates all factory implementations to use the v2 interfaces (in v3, these inherit from the new interfaces).
• Updates all factory implementations implement the v2-specific methods (these proxy to the v3 methods).
• Simplifies test setup in the ServiceFactory significantly, and reverts v3-specific zend-servicemanager setup to use setup compatible with both versions.

Additionally, this patch updates the Zend\Navigation\View\HelperConfig class to ensure it works correctly against both v2 and v3 releases of zend-servicemanager. In particular, it adds testing to the class, which uncovered an interesting situation: the documented navigation_helpers configuration previously did not work! With this patch, it now works correctly, regardless of version.

[weierophinney]

Marked as WIP, as realized the aliases and factory names listed in Zend\Navigation\View\HelperConfig need to be updated, based on feedback since the zend-view 2.6 release series..

[weierophinney]

No longer a WIP; all tested and working now!