MAINT: type attr added to style element

<style type="text/css">
MAINT: type attribute to style element
MAINT: added type attr for style element, removed "/" in "/>"

1. <img /> is changed to <img> for html5 support
2. <style> changed to <style type="text/css">
BUG: border css value mentioned incorrectly in img tag
DEV: border attr for img mentioned in css

as supported by html5
DEV: center table using css

previously table is aligned in center using <center> which is not supported by html5
So, this feature is now added using CSS
DEV: forward slash removed for img, br tags

forward slash "/" not necessary for html5
ENH: update theme version
Merge pull request #12 from ksurya/cleanup

ENH: HTML Cleanup