add rule that checks for assignments in while/if/.

fixes https://github.com/mozilla/scanjs/issues/130
my gitignore

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Merge pull request #1 from mozilla/master

Update branch to mozilla
µ it is..
Merge pull request #2 from mozilla/master

merge from upstream
Add check for assignment in ifstatement

in progress for more rules
remove semi colon in testhit
use findNodeAt to recursively look for assignment
Add support for $_contains
Generalise Ifstatement matching with $_contains

fix a bug
change to use
Merge pull request #148 from mozilla/replace-dollar-placeholder

Replace dollar placeholder
Merge branch 'unintended-assignment' of https://github.com/codelion/scanjs into codelion-unintended-assignment
added support for $_unsafe
document $_unsafe in readme
re-add assignment typo rule
Merge branch 'codelion-unintended-assignment'
#155 - add idea to gitignore
#155 - Enabling parser change in scan.js
#155 - Working on the AST switchout, starting to migrate mocha tests