Fixing less @import paths in auth/base/tree.

These paths were problematic for --NotebookApp.use_less=True mode.
Indenting MathJax rendered equations in rendered_html divs.

This is designed to match the indentation level of MathJax equations
in output.
Compiling CSS for this branch.
Centering for tables/images/math in Markdown.
Adding 1em spacing above and below tables in rendered html.
Removing extra comment.
Removing page.less from base style.less.
Refactoring the center/left justify.
Adding this feature to whatsnew.
adds the optional parameter -s to the magic %load that loads specific function or classes from the python source given. forcing the patch ignoring whitespace changes
skip doctests. comments on the function
fix docstring
better end block detection, ignoring blank lines
add extra blank lines on the test to proof they are ignored
Return value directly from the try block and avoid a variable
assignment.
Avoid temprary variable assignment by returning value directly from try
block.
adding get_text_list helper inspired in django's one
As @minrk recommends, warning if one or more symbol are not found
generalizing get_text_list helper
better comment for the algorithm