fix misspellings

Merge pull request src-d#47 from TripleDogDare/fix-repository-pulldef…

…ault

Fix PullDefault to not cause panics.

undo import enforcement

file, added field Mode

File, added size and reader is now a method

File, added size

remove package doc

Merge pull request src-d#17 from alcortesm/fix-zlib-invalid-header

fix zlib invalid header error

Merge pull request src-d#12 from alcortesm/hotfix-close-packfile

missing call to Close on Fetch return value (ReadCloser)

Merge pull request src-d#11 from alcortesm/ignore-submodules

Ignore submodule dirs (empty directories without associated object)