How to use rosinstall to download git source?

edit

I tried to use the code,but failed:

  - git:
       uri: http://code.in.tum.de/git/cram-pl.git
       local-name:cram_pl

How to fixed it?

Thank you~

 sam@/home/sam/code/ros/rosinstall_auto$ rosinstall .      /opt/ros/diamondback ./cram_pl.rosinstall 
 rosinstall operating on /home/sam/code/ros/rosinstall_auto from      specifications in rosinstall files  /opt/ros/diamondback, ./cram_pl.rosinstall
 processing config_uri /opt/ros/diamondback
 ahhhhhhhh, yaml parse error: while scanning a simple key
   in "/home/sam/code/ros/rosinstall_auto/cram_pl.rosinstall", line 3, column      6
 could not found expected ':'
   in "/home/sam/code/ros/rosinstall_auto/cram_pl.rosinstall", line 4, column      1
 Usage: rosinstall PATH [<options> ...] [URI]... 

 rosinstall: error: None

 sam@/home/sam/code/ros/rosinstall_auto$