Rewirte the Makefile rules with latexmk.
Add GNUMake into README.
Correct subsubsection's format typo.
Update Makefile rules to ignore errors from latexmk, so that ```make
release``` and ```make && make view``` can work.
Update version number to 0.5.3
Merge from master: Correct subsubsection; add files .gitignore .latexmkrc; Correct latexmk usage in Makefile.