Have manual entry working

Take a look at the diffs and let me know what you think but here is what happens when I run it now:

    BMC (working_on_manual_entry)$ python bmc.py import ~/Desktop/yadin_1965.pdf
    DOI / arXiv / ISBN / manual / skip? manual
    The bibtex entry found for /Users/vince/Desktop/yadin_1965.pdf is:
    <bibtexparser.bibdatabase.BibDatabase object at 0x105f10f10>

    The bibtex entry for /Users/vince/Desktop/yadin_1965.pdf is:
    @article{avi1965sequence,
	author={Avi-Itzhak, B and Yadin, M},
	journal={Management science},
	number={5},
	pages={553--564},
	publisher={INFORMS},
	title={A sequence of two servers with no intermediate queue},
	volume={11},
    	year={1965},
    Is it correct? [Y/n] Y
    Tag for this paper (leave empty for default) ?
    New name [/Users/vince/Papers/Avi-Itzhak_Yadin-Management_science-1965 (2).pdf]?
    /Users/vince/Desktop/yadin_1965.pdf successfully imported as /Users/vince/Papers/Avi-Itzhak_Yadin-Management_science-1965 (2).pdf.

Not sure if this has broken anything else as I haven't figured out if you have a testing framework yet or not :)

Thanks for this by the way, I will definitely be using it and have a couple of ideas for other things that I might like to work on...