Stop overriding level of headings

No longer set aria-level on section headers.
Fixes #308
Removed check for aria-level
Removed aria-level checks.
Removed aria-level check.
Add event publication when saving

Add event notifications to the save functions so that specifications can, if they wish, subscribe to the events to do processing prior to saving a snapshot (e.g., if a spec has some dynamic content and the author wants to be certain it is in a base state before saving).
Moved the notifications

Moved the calls to respecEvents.pub into the toString and toXML
methods so that they get called even in the event of a browser that
supports direct downloading.
add overrideLogo support
Typos.. Change overrideLogoLink to overrideLogoURI for consistency
Change syntax to support overrideLogos
update .gitignore
change name to logos (per github comment)
Correct pointer for Travis
Add a pointer to respec-docs

Added a section with a pointer to respec-docs.
Update requireConfig.paths.ui to fix 'Save Snapshot' regression from migration.
Merge pull request #338 from anssiko/fix-requireconfig-paths

Update requireConfig.paths.ui to fix 'Save Snapshot' regression from migration.
Merge pull request #335 from halindrome/patch-6

Saving should support a respecEvent
v3.2.19
Merge pull request #336 from sglaser/feature/overrideLogo

add overrideLogo support
v3.2.20
support for sequence<Promise<T>> ; close #331