With this we completely get rid of the @merge_context variable,
and all the merging happens in Tag::Class or MemberTag subclasses.

A bit of a duplicated code in Cfg and Property, but we get rid of
the explicit check for :cfg/:property/:css_var in Type class.

This contains a fix for the changed newline handling in IE10.

Fixes: #373

Only use the :method category in @merge_context.

So no more does one need to choose between two types when creating
his own member type.

The only problem at the moment is that I needed to add explicit check
for :cfg/:property/:css_var to Tag::Type#merge.

Add :default and :optional config options and only return these
fields when these configs present.  With this we now also allow
the syntax for default values without the optionality-braces:

    @mytag {Type} name=<some funky default value>

Added a separate testsuite and updated all calls to
Scanner#standard_tag().

Related to: #374

Previously there were installation problems with therubyracer 0.11.x,
especially in OSX. But these are now gone with later versions of
therubyracer, so we can safely remove this restriction from JSDuck
dependencies.

Fixes: #371

Calculate exp and var locally as needed.

Do the proper_function? detection just once.

Do all the method-data detection inside it.

Significantly improve readability.

This class really only deals with detecting the return type - so
the old name was not precise enough.

The URL gets now returned by the search server in correct format.

But this time instead of re-running the search every time we
need to navigate to a new page, just remember the search results
and only render the page.

Avoid searching at all when search term hasn't changed.

Do a basic search after small delay and then improve the results
of it with a guides search after a bit longer delay.

- Drop body text shortening (fragsize param takes care of that).
- Instead of shortening URL, prepend the #!.
- Add params to query.
- Collapse continuous whitespace.

Used the wrong method and didn't test :(

Fix CSS to only target actual links.

Instead of numeric myguide-section-3 we now get derive heading ID-s
from heading text.  For example: myguide-section-getting-started

Also added testsuite for GuideToc.

Created GuideAchors class which transforms the hashes in links
and ID-s in anchors so they don't interfere with Docs app #!-navigation.

Relaxed the pattern matching of guide URL-s in Docs app and added
support for navigating to <a name="..."> anchors.

For classes we now always show the short name in tab title and full
name in tooltip.

For guides/videos/examples the title and tooltip are the same, with
tooltip providing a way to see the title when it's too long to fit
on the tab.

Fixes: #369