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
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
bugfix. parse of non python code returns a tuple as expected
return an specific error for non python
Merge pull request #4311 from mgaitan/load_symbol_extractor

%load -s to load specific functions or classes