Fix for journal entry line_items type

They should actually be lines since lines have journal entry line details.
Merge pull request #137 from markrickert/journal-entry-line-fix

Fix for journal entry line_items type
Update from upstream
Add auto_doc_number support for CreditMemo and dry up auto_doc_number specs with a shared_example
Move 'include DocumentNumbering' to beginning of models
Implemented support for ItemBasedExpenseLineDetail in BillLineItem
Merge pull request #140 from minimul/cm-autodoc

Add auto_doc_number support for CreditMemo and ...
Transaction level tax support for CreditMemos
Merge pull request #142 from minimul/cm-tax

Transaction level tax support for CreditMemos
Adds refund receipts
Update readme to include refund receipts
Fix refund receipt test
Merge pull request #144 from n8armstrong/refund-receipts

Merge Refund Receipts
0.1.4 release
EmployeeNumber can be a string
Merge pull request #145 from nickgervasi/master

EmployeeNumber can be a string
Fixed #147: initialized Payment#line_items as an empty array
Merge pull request #148 from arthurchui/topic-147

Fixed #147: initialized Payment#line_items as an empty array
Added Line#credit_memo_id
Merge pull request #149 from arthurchui/master

Support to set invoice_id and credit_memo_id