removed bin/.gitignore as a consequence of #89, 065566cd0467d51d2f9eb0031f54eb2b6f6342a0, and acc83c676a702a158ceefc6915e8607868f9ffe2
added *.elf to gitignore
added bin folder to ignore list
Merge pull request #14 from OlegHahm/remove_bin_folders

removed bin/.gitignore

this is a fix PR, current master needs this to be consistent