Merge pull request #19 from salfter/master

add some coins, and fix bug referenced in https://bitcointalk.org/index.php?topic=172121.msg2826282#msg2826282
Merge pull request #20 from salfter/master

add Bitgem support
Merge pull request #21 from salfter/master

add Grandcoin & Lebowski support
Merge pull request #22 from salfter/master

add Hobonickel support
Merge pull request #23 from salfter/master

add Spot support
Merge pull request #24 from salfter/master

add Craftcoin support
add Zetacoin support