escape control characters

fix test-framework import

fix link to wren

Merge pull request #9 from brandly/error-position-pt-2

enforce full error messages for most parsing errors

simplify testing because i cant figure out how to do like error.startsWith with Expect

add Token.End to end of tokens lists

expand scanningError to report positions

add test for empty string

expand Token to track an index, define getPositionForIndex, add position to error output when parser fails

remove unused methods

Merge pull request #8 from brandly/consume-all-text

handle escaped chars properly

rename whitespace to whitespaceChars

refactor scanner to consume every single character