GRECLIPSE-1789 Add non default output locations to classpath.
GRECLIPSE-1789 Add check for Groovy Nature
GRECLIPSE-1396 Initial fix is broken as declaring class for Parameter is null now. Changed for origin type.
GRECLIPSE-1788
ReturnStatement is now a multiline node
GRECLIPSE-1788
Minor test modifications
Merge pull request #87 from DenisMurashev/GRECLIPSE-1789

GRECLIPSE-1789 Add non default output locations to classpath.
Merge pull request #89 from kizhaevv/master

GRECLIPSE-1788
Merge pull request #88 from DenisMurashev/GRECLIPSE-1396

GRECLIPSE-1396 Updated fix
Upgraded groovy-eclipse to Eclipse 4.4.1 #5781fc0
removed 3 unreliable tests