updated quickstart guide and added option to install polaristools onl… #44

Job	Run time
MacOS :: llvm :: system ccfits cfitsio	6m 57s
Ubuntu :: gcc :: Release :: :: system ccfits cfitsio	2m 31s
Ubuntu compile.sh :: gcc :: make	3m 58s
Ubuntu :: clang :: Release :: :: system ccfits cfitsio	2m 14s
Ubuntu compile.sh :: gcc :: ninja	2m 48s
Ubuntu :: clang :: Debug :: -fsanitize=address :: system ccfits cfitsio	19m 11s
Ubuntu compile.sh :: clang++ :: make	4m 49s
Ubuntu compile.sh :: clang++ :: ninja	3m 7s
	45m 35s

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