Merge branch 'master' of https://github.com/paulhession/protocol-docs

Conflicts:
	.gitignore
Minor fixes to language.
Fixed typos
Add document type `cheque`
Merge pull request #147 from OttoAllmendinger/pr-cheque

Add document type `cheque`
Rename UserID -> NymID, assetContract -> instrumentDefinition.
Merge pull request #149 from benma/master

Rename UserID -> NymID, assetContract -> instrumentDefinition.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	content/doctypes/OTmessage.md
	content/doctypes/accountLedger.md
Delete OTmessage.md
Asset contract --> Instrument definition contract

Made additional corrections
Merge pull request #150 from paulhession/master

Minor corrections
Corrections to language
Merge pull request #151 from paulhession/master

Corrections to language
Fixed line wrapping
Merge pull request #152 from paulhession/master

Fixed line wrapping
Update cheque.md
Merge pull request #153 from paulhession/master

Update cheque.md
Update Requirements.md
Update cheque.md
Update cheque.md