updated changelog for 2.1 and 2.2
Added 2.1 and 2.2 releases to changelog
Fix issue 861: configure.sh fails on mac os x
Merge pull request #878 from benemorius/fix_configure_script_for_mac

Fix issue 861: configure.sh fails on mac os x
Move exception out of crypto_util
Refactor guid exists check
Merge pull request #880 from hoffmabc/decline-legacy-msgs

Move exception out of crypto_util
Merge pull request #876 from gubatron/changelog-sync-issue-831

Changelog sync - Issue #831
Remove zlib dependency and usage
Return early when decryption fails. Fix #883.
Merge pull request #885 from Renelvon/fix_unbound

Return early when decryption fails. Fix #883.
Up the version
Merge pull request #877 from hoffmabc/hotfix-compression

[Hotfix] Remove zlib compression calls
Merge branch 'master' into backmerge-0.2.3

Conflicts:
	configure.sh
	node/connection.py
	node/transport.py

* Immaterial conflicts in configure.sh.
* Immaterial conflict in node/connection.py: Since #839 the message is
  sent uncompressed by default.
* Conflicts in node/transport.py due to various refactorings, mostly the
  PeerListener extraction (#678): _on_raw_messge now resides in
  node/connection.py and it does not decompress the message since #839.
Update changelog and README.
Merge pull request #886 from Renelvon/backmerge-0.2.3

Backmerging master 0.2.3
Version bump for Beta 2.3
Merge pull request #887 from dionyziz/beta_2_3_changelog

Version bump for Beta 2.3.
Make OB singleprocess in frozen mode
Add scripts for configuring and executing OB in Windows.