In Section 2.0, updated formatting for proper bullets.
Fixed typo
Copy changes in section 2.0

These are copy edits to make the explanation of the role of the xAPI a
bit more targeted.
Merge pull request #163 from NickWashburn/master

Fixed typo
line length
Merge pull request #1 from bscSCORM/silvers

line length / spacing
Spaces needed to render line break
Merge pull request #166 from bscSCORM/linebreak

Spaces needed to render line break
Merge pull request #162 from aaronesilvers/master

Section 2.0, updated formatting for proper bullets and copy changes
attachment clarification
correction
Merge pull request #168 from bscSCORM/attachment

DISCUSS: attachment clarification
eventual consistancy

* Created a section for common requirements when PUT-ing or POST-ing statements,
moved existing common requirements to that section
* Added eventual consistancy requirements
switched upconversion prefix from urn: to tag: as decided on call
Merge pull request #172 from bscSCORM/conversion

switched upconversion prefix from urn: to tag: as decided on call
Merge branch 'master' of https://github.com/adlnet/xAPI-Spec
add section on data constraints
attempt to deal with spacing issue
more space fiddling
minor wording change