fusion 7.x-2.0-beta1

Includes minor bug fixes and an improvement to handling IE-specific CSS.

• #1328806: Implement a better approach for IE-specific CSS by @sheena_d, adopted "No Conditional Styles OR CSS Hacks" approach to ie-specific styling proposed by Paul Irish.
• #1340348: Excess spacing above primary menu block in starter theme - corrected spacing issue with main menu in starter themes.
• #1340238: "System help" block overflows the help region - no longer wrapping help region in theme('grid_block').
• #1340252: Missing icon for warning type of drupal_set_message() - restored warning icon, and defaulted to more core styling.
• #1322092: Undefined index error on available updates page with fusion 2 - fixed undefined index issue in available updates list caused by a hidden base theme.
• Fixed warning, "Notice: Undefined variable: node_bottom in include()".
• Provided support for node_top and node_bottom regions when using context module to load blocks.