Log Message:
Update 0.20 to 0.23
-------------------
0.23
  - fix test error on Windows due to the use of
    unescaped paths in regex patterns (by nanis) #11 #13
0.22
  - fix regression in 0.21 (use of here-doc within `<?= ?>` causes syntax \ 
error) #12
  - add support for `prepend` property for prepending code (by LoonyPandora) #3

0.21
 - fix the strange rule for multi-line expression #10