Paragraph & math indent related changes for LaTeX 

Users like to put spaces between math formula and text while they edit notebook content. However this causes LaTeX to generate extra space between formula and paragraph. I tried many things to fix this, asked around 

http://tex.stackexchange.com/questions/95848/space-above-equations

however, the only way to fix it seemed to be to remove newline+formula start and formula end+newline from the output, in the Python code. 

I also added few math and paragraph indent changes (making some zero) - I believe the output now looks much more "blog-like" now, and visually it seems better IMHO.