Bug: 402384 Add CONTRIBUTING file

Signed-off-by: Denis Roy <denis.roy@eclipse.org>
use extension classloader as parent by default
[contentAssist] Updated outdated documentation comment
[xtend][anonymousClasses] Fixed local var capture logic and shadowing

see https://bugs.eclipse.org/bugs/show_bug.cgi?id=435249
[xbase][visibility] Fixed regression in visibility check

see https://bugs.eclipse.org/bugs/show_bug.cgi?id=435685
[xtend][compoundOperators] Fixed exception in compiler

Also added test case with @Ignore annotation. Will file
a ticket for the issue that is reproduced by this test
[xtend][nestedClasses] Allow abstract nested classes

see bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=435892

Change-Id: I4042a9c1fe63873a4b6ddd02b94ef7133d16fb37
[xtend][macro] Some fixes with qualified name computation

see https://bugs.eclipse.org/bugs/show_bug.cgi?id=435897

Change-Id: Ia3fb7c4ceb386c8663f1116f014e8b88ed0d032c
[bug 436163]: fixed compound assignments compilation

Change-Id: Ib340d040609c239a35829b886e6ffd11434b1439
Signed-off-by: akosyakov <anton.kosyakov@itemis.de>
[distro] 2.6.0 distro settings
[bug 435402]: value should be expected for the synchronized expression's
param

Change-Id: I489e3caaae46e540ba5496aa96030313511b63ce
Signed-off-by: akosyakov <anton.kosyakov@itemis.de>
[releng] increasing version to 2.6.1
Merge "[distro] 2.6.0 distro settings"
[xtend][anonymousClasses] Fixed another name occurrence

Another location where the internal name of an anonymous
class was surfaced in the UI.
[bug 435713]: basic for loop should open a new pseudoscope (without
shadowing) instead of java scope (with shadowing)

Change-Id: Icd0827912d3e009f7f0ebaf341ce0df6a1d0858a
Signed-off-by: akosyakov <anton.kosyakov@itemis.de>
[bug 435638]: ValidationJob should not process issues if the view was
discarded

Change-Id: I15f5a410b4c99ae3005b869a64c6e2d2da45c4bb
Signed-off-by: akosyakov <anton.kosyakov@itemis.de>
Merge "[releng] increasing version to 2.6.1"
Merge "[xtend][anonymousClasses] Fixed another name occurrence"
Merge "[bug 435713]: basic for loop should open a new pseudoscope (without shadowing) instead of java scope (with shadowing)"
Merge "[bug 435638]: ValidationJob should not process issues if the view was discarded"