Header Rewrite

Early Adopters Beware. Major rewrite to the header.php and
header-extensions.php Added legacy.php in legacy directory as a
repository for legacy functionality as Thematic transitions into more
HTML5 compatible format
See the changes to the readme.txt on this commit for more information.
Thematic 1.1 alpha set theme options for legacy xhtml mode

Changing to alpha in versioning. Deprecated thematic_head_profile.
Introduced thematic_head . Changed tabbing structure to tidy html
output. Fixed some copy/paste typos. Removed invalid ref="generator"
from shortcodes.php. Added theme option for leagacy xhtml switch.
Backwards copatibilty checks anre not complete as of yet. Rearranged
deprecation from last commit to reside in deprecated.php
Removing copypasta of the thematichtml5 plugin
Set activation for legacy mode on front end

Activate legacy theme supprt when theme topytion is present and load
the leagcy.php.
Fixed parse errors and typos in deprecated.php and legacy.php
Legacy XHTML Validation Issue

Remove extra quote from leagacy meta content.
Theme options corrections

Checkboxes were inpossible to uncheck due to the unckecked submissions
returning null and not validating to a zero.

Cleaned up code indention.
Update style.css
Remove references to severely outdated plugins.

The Platinum SEO and Comment-lisence plugins are no longer maintained. Reference to them should be removed (Platinum SEO should perhaps be depreciated in the theme as well).
Wrap siteinfo in a paragraph tag.
Avoid margin on siteinfo div due to added paragraph tag.
Remove references to the old ThemeShaper forums and google code.
Merge pull request #37 from SeamlessThemes/develop

Update readme references to Thematictheme site and github
Wrap siteinfo in paragaraph tags
Remove references to outdated plugins in readme file
Add missing word "can" in readme.html
Add class attribute for all browsers in thematic_html

See https://github.com/ThematicTheme/Thematic/commit/4a62381a929ef8f8ac70915c9a1af1d2cc090d72#commitcomment-3505475
Update readme.txt

Add a more generalized message.
Merge branch 'master' of git://github.com/SeamlessThemes/Thematic into SeamlessThemes-pull40

Closes #40
Remove redundant robots "follow" meta tag, since it is default behaviour

Close #42
Change handle of enqueued stylesheet to use child theme name

See #39
Clarify docblock of thematic_create_stylesheet()
Merge pull request #43 from middlesister/feature/remove-default-robotstxt

Remove redundant robots "follow" meta tag, since it is default behaviour