Made readme.md more clear and fixed bug in installer.sh #2
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There was a bug in installer.sh that caused an empty "if / fi" to be added to the user .profile, which causes an error to occur at startup, if installer.sh is ran more than once.
I also clarified the readme.md and made mention of one missing dependency (python-pygame).
Since most tools like this require you to image an SD card from a separate computer, I foolishly ran these original instructions from my Linux box, not from Raspbian. The original wording mentions "With a FRESH SD CARD" which implies that it's new, blank, or formatted - NOT that it has Raspbian or another OS loaded already. I should have checked the script first, but also the instructions should be clearer.