Missing long-fill-in interaction type

Capturing the updates for GitHub issue #473 discussed last week
small correction for 7.2.3, related_activities
addresses @andyjohnson's suggestion in #326
Fixes #396
Addresses https://github.com/adlnet/xAPI-Spec/pull/383#discussion_r6263614
Fixes #447 and adds a link on OAuth 1.0 

Because it seemed weird to link to OAuth 2.0 and not 1.0.
Fixes #461

Using http://example.com/xAPI/ to match other examples.
base iri -> base endpoint
Added language surrounding spec requirements

Per the call on August 6, 2014
Add note on delimiters
Merge pull request #493 from garemoko/delimiters

Delimiters
Merge pull request #492 from andyjohnson/master

Added language surrounding spec requirements
Merge pull request #490 from garemoko/base_endpoint_definition

Base endpoint definition
Merge pull request #489 from garemoko/oauth2_link

Fixes #447
Merge pull request #487 from garemoko/see_7_8_details

Fixes #396
Merge pull request #478 from RoboSparrow/fixes

Small correction for 7.2.3, related_activities
Merge pull request #476 from chrishandorf/master

Missing long-fill-in interaction type (raised by chaimleib-scorm)
Merge pull request #486 from garemoko/moreinfo_table

addresses @andyjohnson's suggestion in #326
Added revision history links

Should fix #504 and #505
Changed formatting