[CHG] : Rename README to README.rst (https://github.com/OCA/pos/pull/6#issuecomment-66383621)
[CHG] : Rename module to pos_pricelist instead of the old one
[FIX] : Fix typo mentioned on this comments :
 - https://github.com/OCA/pos/pull/6#discussion_r21574900
 - https://github.com/OCA/pos/pull/6#commitcomment-9012800
[IMP] : Recover a missed feature while setting a price for an orderline https://github.com/OCA/pos/pull/6#discussion_r21575474
[IMP] : Switch to while loop while iterating over an array
[REM] : Avoid bad practice on Object Class : https://github.com/OCA/pos/pull/6#commitcomment-9012727
[ADD] Some functional testing