Minor typo correction

formely->formerly
Update incorrect docs in tonePitchFollower example

The comments state that the speaker should be on pin 8, but the code references pin 9. Updated the comments to reflect the correct pin.
IDE didn't stop if an invalid library is found
Better error handling for missing preferences.
Fixes #1471
Hardened upload.tool property reading code for boards.txt
Fixes #1464
Merge pull request #1465 from mcoms/patch-1

Update incorrect docs in tonePitchFollower example
assembly compile recipe is missing (C. A. Church)
Fixes #1457
Merge branch 'master' into ide-1.5.x