WIP -- Start refactoring to avoid unsafe outside of table
comment
Fix as directed by nikomatsakis
Merge remote-tracking branch 'niko/pczarn-hashmap-opt' into hashmap-opt

Conflicts:
	src/libstd/collections/hashmap/map.rs
	src/libstd/collections/hashmap/table.rs
Fix test_resize_policy. Explain
Tests pass
Use SearchResult enum to preserve references and avoid unsafe blocks
Add the remaining comment
add hashmap view