Fixes for 1.3.20 release
Enabled all the doc generation
Fixed issue for selectors on remove where  is uses
1.3.21 fixes
Bumped bson version to use nan 0.6 fixing 0.10.22 issues
Bumped json package to 0.2.5
Spelling fixes I noticed

acieved -> achieved
occured -> occurred
occurence -> occurrence
convinence -> convenience
primarky -> primary
whis -> which
concated -> concatenated
Merge pull request #1140 from ehershey/patch-1

Spelling fixes I noticed
Update gridfs.md

correct exemple of seek
Merge pull request #1144 from benzen/patch-1

Update gridfs.md
Fix type in docs: s/locahost/localhost/
Merge pull request #1182 from alFReD-NSH/master

Fix type in docs: s/locahost/localhost/
Update Readme.md
Merge pull request #1185 from basarat/patch-1

Update Readme.md
Merge branch 'master' into 1.4