Fix a bug where clean pages could be evicted when they contained updates required for a running transaction.
Include the current transaction when calculating the oldest snapshot ID.
Fix ordering of application eviction so a session's read-committed transaction can't block eviction (for forced eviction of big pages).  Fix a race calculating the oldest snapshot ID required for eviction.
typo
Add a comment about tracking the largest transaction ID during reconciliation.
Merge pull request #539 from wiredtiger/evict-clean-bug

Fix a bug where clean pages could be evicted when they contained updates required for a running transaction