Revert "Merge branch 'GRECLIPSE-1727-FIXES' of https://github.com/DenisMurashev/groovy-eclipse into DenisMurashev-GRECLIPSE-1727-FIXES"

Reverting because not compatible with Eclipse 4.3:

26-Jun-2014 16:02:25 	[ERROR] Failed to execute goal org.eclipse.tycho:tycho-compiler-plugin:0.19.0:compile (default-compile) on project org.eclipse.jdt.groovy.core: Compilation failure: Compilation failure:
26-Jun-2014 16:02:25 	[ERROR] /opt/bamboo-home/xml-data/build-dir/GRECLIPSE-E43P-JOB1/base/org.eclipse.jdt.groovy.core/src/org/codehaus/jdt/groovy/internal/compiler/ast/GroovyClassScope.java:[238]
26-Jun-2014 16:02:25 	[ERROR] ReferenceBinding actualType = param.actualType();
26-Jun-2014 16:02:25 	[ERROR] ^^^^^^^^^^
26-Jun-2014 16:02:25 	[ERROR] The method actualType() is undefined for the type TypeBinding
26-Jun-2014 16:02:25 	[ERROR] 1 problem (1 error)

This reverts commit 013d56bdbba1e2798a057b1b4c4c45bd14ca4466, reversing
changes made to 0786dcfd3e43ee6e23d05c5d5c2e1ea0f2df9a2e.