Make require() compliant with CommonJS 1.0

This includes potentially breaking changes.
  Specifically, before this patch tiddlywiki would default to relative module identifiers
  Now, tiddlywiki will only search relative paths if explicitly specified
  Additionally, some "defaulted export contexts" were removed
    (some modules may make assumptions about context)
Some unit tests were modified slightly from their originals
  Tiddlywiki doesn't have a notion of a "main" program's path
  Some require calls were explicitly made relative
  None of these changes should affect the requirement under test in each case
Fix up descriptions for tests
Cleaned up some dead/commented in patches.
Some quick style cleanup to commonjs patches
Additional improvement to CommonJS Modules support
 Now implements (and mostly follows) requirements of Modules/1.1 spec
  implementes only the required "secure sandbox" subset of the spec
  `module` free variable changed from the `moduleInfo` to an id container
  `require` free variable given a "main" property
  boot module scope closed and exported
    this also changes the interface between boot and bootprefix slightly
    (should now be able to create multiple TW instances under node)
 BREAKING CHANGES:
  The tiddlywiki module itself now exports a single constructor function
  Modules which depended on `module` referring to `moduleInfo` will break
  Modules which don't conform to Modules/1.1 will break
    (by attempting to modify require.main or module.id)
Merge pull request #160 from natecain/commonjs

CommonJS Modules/1.1 Conformance
Revert "Merge pull request #160 from natecain/commonjs"

This reverts commit 661621c3f76bf847c458fa4f639bd40f4bdefc41, reversing
changes made to d3d72eff1be4a684f8484e83ea7d369e0d6d9741.
Merge branch 'fs_watch' of https://github.com/natecain/TiddlyWiki5 into natecain-fs_watch
Provide an exports object in the evalSandboxed context of jasmine-plugin
Make require() compliant with CommonJS Modules/1.1
Fix search filter so that titles and tags of binary tiddlers are searched
Fixed bugs in previous commit to extend search to titles and tags of binary tiddlers
Add skype: protocol for external links

The matching of external links is hacky at the moment. The plan is to
make it more easily extensible (ie without writing code)
Fix misnamed style tiddler in the read only theme
Prevented generation of illegal elements

Previously, text like <-> would try to generate an element with an
illegal name, causing a JS error
Speculative patch for issues with #176 on osx
Another speculative fix to filesystemadaptor for osx
  implements the approach Jeremy described
  adds a rudimentary tiddler equality check to wiki