Merge pull request #1 from rexim/master

Requiring helm-files.
Extract git-grep helm-type-attribute
Fix indent
Support various actions like helm-do-grep

- Find file other frame
- Find file in Elscreen
- Find file other window
Fix a warning about elscreen-get-conf-list

helm-git-grep.el:234:1:Warning: the function `elscreen-get-conf-list' is
    not known to be defined.
Support "Save results in grep buffer" action
Chage candidates from multi line to one line
Set candidate-number-limit to 9999
Fix a bug that don't get git top dir in dired
Customizable candidate-number-limit
Extract helm-git-grep-1 function
Remove unnecessary require statement
Fix buffer name
Dump version to 0.2
Fix a bug about incorrect default-directory
Rename grep-save-results buffer to *hggrep*
Add helm-git-grep-history
Add persistent action
Add helm-git-grep-map
Add mode-line