[PAXURL-230] Upgrade to Eclipse Aether and Maven 3.1
[PAXURL-230] updated to Aether 0.9.0.M3 and Maven 3.1.1
[PAXURL-138] Environment variables in Maven settings.xml not recognized

Test case with environment variables, using maven-settings-builder
Merge branch 'upstream'
applied formatter
[PAXURL-233] Use maven-settings-builder to parse settings.xml

There is still some duplication in old and new implementation which needs further cleanup.
moved license to top
changed version to 2.0.0-SNAPSHOT
Merge branch 'upstream'

Conflicts:
	pax-url-aether/osgi.bnd
	pax-url-aether/pom.xml

Some tests are failing.
[PAXURL-239] Upgrade to Wagon 2.5
[PAXURL-230] fix ProxyTest by adding Wagon authenticator
[PAXURL-230] fixed authentication
[PAXURL-230] propagate local repo
[PAXURL-230] all tests successful
Merge remote-tracking branch 'upstream/master'

Conflicts:
	pax-url-itest/pom.xml
Merge pull request #8 from hwellmann/master

[PAXURL-230] Upgrade to Eclipse Aether 0.9.0.M3 and Maven 3.1.1