Renamed bitcoin to bitcoin-core

Closes #3634.
add exception for Cask name `bitcoin-core.rb`

references #4277, #3634
Add Baidu Music
sage 6.2
Merge pull request #4318 from iml/patch-1

Sage 6.2
update thunderbird
update lyrics-master
Merge pull request #4320 from eugenesan/mozilla

Update Thunderbird to 24.5.0
Merge pull request #4319 from shishi/update_lyrics-master

Update lyrics-master to 2.4
Add gmail-notifier (2.0.1)
Merge pull request #4322 from dlackty/gmail-notifier

Add gmail-notifier (2.0.1)
Add feedbin-notifier (1.0.1)
Merge pull request #4321 from dlackty/feedbin-notifier

Add feedbin-notifier (1.0.1)
Fantastical 1.3.15
Vagrant Manager 1.3.1
Merge pull request #4325 from ahbeng/fantastical-1.3.15

Fantastical 1.3.15
Merge pull request #4317 from tolbkni/baidumusic

Add Baidu Music
Merge pull request #4326 from NanoXD/master

Vagrant Manager 1.3.1
Merge pull request #4277 from vitorgalvao/rename-bitcoin

Renamed bitcoin to bitcoin-core
Merge pull request #4300 from rolandwalker/bitcoin_core_name_exception

add exception for Cask name `bitcoin-core.rb`