Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
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Merge pull request #27 from vishalsodani/master

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Merge pull request #28 from 1126/master

Tiny corrections to ch3.
editline instructions for mac
Fixed 404. Added paypal button. Fixed wording in chapter 3.
Merge github.com:jtal/BuildYourOwnLisp into temp
Some changes to the text for using editline on mac
tips to donations
Switch to prompt variable in source and other chapter
removed extra "in"

trivial change
missing "is"

minor edit
Merge pull request #34 from radiofreejohn/patch-3

removed extra "in"
Merge pull request #35 from radiofreejohn/patch-4

missing "is"
code/html: fix double free condition with lval_del
Merge pull request #36 from radiofreejohn/master

code/html: fix double free condition with lval_del
minor fix: Lets->Let's
Fix typo: exactly -> exact