Start to develop v0.6.2

Reviewed-by: insanehong <insane.hong@navercorp.com>
ui.Select2: handle issueLabel in exclusive category

Remove label which category is same with selected label from current data
if selected label belonged exclusive category
Issue: Fix problem .issue-info shrinks on affixed
Merge branch 'fix/issue-1800' of dlab/hive

from pull-request 1285

* refs/heads/fix/issue-1800:
  ui.Select2: handle issueLabel in exclusive category

Reviewed-by: 김덕홍 <insanehong@navercorp.com>
Merge branch 'fix/issue-1789' of dlab/hive

from pull-request 1286

* refs/heads/fix/issue-1789:
  Issue: Fix problem .issue-info shrinks on affixed

Reviewed-by: 김덕홍 <insanehong@navercorp.com>
PullRequest: fix to fill title/body automatically from merge result
Merge branch 'fix/issue-1804' of dlab/hive

from pull-request 1288

* refs/heads/fix/issue-1804:
  PullRequest: fix to fill title/body automatically from merge result

Reviewed-by: 김덕홍 <insanehong@navercorp.com>
jgit: Fix the server error when send a pullrequest

SymlinksNotSupportedException might occurred in ResetCommand because
jgit 3.3 or more supports creating symlink on checkout but it fails
if org.eclipse.jgit.java7 does not exist.
Merge branch 'fix/jgit-symlink-not-supported-exception' of dlab/hive

from pull-request 1289

* refs/heads/fix/jgit-symlink-not-supported-exception:
  jgit: Fix the server error when send a pullrequest

Reviewed-by: 백기선 <keesun.baik@navercorp.com>
Yobi 0.6.2

It is the second maintenance release of Yobi 0.6.

This fixes a major bug of pullrequest and some others.

Reviewed-by: insanehong <insane.hong@navercorp.com>