[MERGE] Make lp-open work in more circumstances

[John Arbash Meinel]

John Arbash Meinel has voted tweak.
Status is now: Conditionally approved
Comment:
I'll tweak this before merging.

I'd rather not plain "import webbrowser" at the top of __init__.py, 
since then every time you run 'bzr status', we load the webbrowser 
module (as part of loading the LP plugin).

However, I can just wrap it in a lazy_import when I go to merge.

For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3Cd06a5cd30902232031y67974f2cq36972783dd40c7af%40mail.gmail.com%3E
Project: Bazaar