added alias for brew cask and git rebase

bash/bash_aliases.d/brew.sh

@@ -0,0 +1 @@
+alias bc='brew cask'

bash/bash_aliases.d/git.sh

@@ -10,6 +10,7 @@ alias gp='git push'
 alias gpl='git pull --rebase'
 alias gplnr='git pull'
 alias gme='git merge'
+alias grb='git rebase'
 alias gb='git branch'
 alias gst='git stash'
 alias gco='git checkout'