Add 'bolt info'.
Merge pull request #158 from benbjohnson/bolt-info

Add 'bolt info'.
add asserts for detecting pgid high watermark overflow
remove stray file
Merge pull request #159 from Shopify/pgid_overflow_checks

add asserts for detecting pgid high watermark overflow
Fix node unit tests.
Fix deletion reclamation.
Merge branch 'master' of https://github.com/boltdb/bolt into fix-deletion

Conflicts:
	node.go
Merge pull request #160 from benbjohnson/fix-deletion

Fix deletion & dereferencing.