[MNG-5613] fix NullPointerException when error occur during project dependency graph creation
Submitted by: Sebastian Le Merdy <sebastian.lemerdy@gmail.com>
From: https://github.com/apache/maven/pull/13
MNG-4226: Detect JAVA_HOME on newer Mac OS X
Submitted by: Christopher Tubbs <ctubbsii@apache.org>
https://github.com/apache/maven/pull/11
MNG-5578 fixed guice OutOfScopeException during multithreaded build

This was a regression since 3.2.1 introduced by my commit 48fec944

Signed-off-by: Igor Fedorenko <ifedorenko@apache.org>
MNG-5625: Provide a terse information about the used thread builder
extended javadoc
MNG-5625: Correct the wording of the log message
MNG-5625: Fix typo
Merge branch 'master' of https://github.com/nerro/maven
Merged https://github.com/apache/maven/pull/14. This closes #14.
Merged https://github.com/apache/maven/pull/14. This closes #14.
improved javadoc
turn javadoc quiet
Revert "MNG-5624: Maven API Plugin descriptor xsd does not exist at advertised location"

This reverts commit 15aef63c4a57a4fc656baa1f4a168e1eed233159.
fixed errors reported by Checkstyle