CacheDB (#67)

* Add CacheDB & SimpleMap
* Generic memBatch; Fix cLevelDB tests
* CacheWrap() for CacheDB and MemDB
* Change Iterator to match LeviGo Iterator
* Fixes from review
* cacheWrapWriteMutex and some race fixes
* Use tmlibs/common
* NewCWWMutex is exposed.  DB can be CacheWrap'd
* Remove GetOK, not needed
* Fsdb (#72)
* Add FSDB
* Review fixes from Anton
* Review changes
* Fixes from review

Makefile

@@ -11,7 +11,7 @@ all: test
 NOVENDOR = go list github.com/tendermint/tmlibs/... | grep -v /vendor/
 
 test:
-	go test `glide novendor`
+	go test -tags gcc `glide novendor`
 
 get_vendor_deps: ensure_tools
 	@rm -rf vendor/
@@ -32,20 +32,19 @@ metalinter_test: ensure_tools
 		--enable=gas \
 		--enable=goconst \
 		--enable=gosimple \
-	 	--enable=ineffassign \
-	   	--enable=interfacer \
+		--enable=ineffassign \
+		--enable=interfacer \
 		--enable=megacheck \
-	 	--enable=misspell \
-	   	--enable=staticcheck \
+		--enable=misspell \
+		--enable=staticcheck \
 		--enable=safesql \
-	   	--enable=structcheck \
-	   	--enable=unconvert \
+		--enable=structcheck \
+		--enable=unconvert \
 		--enable=unused \
-	   	--enable=varcheck \
+		--enable=varcheck \
 		--enable=vetshadow \
 		--enable=vet \
 		./...
-
 		#--enable=aligncheck \
 		#--enable=dupl \
 		#--enable=errcheck \
@@ -53,4 +52,4 @@ metalinter_test: ensure_tools
 		#--enable=goimports \
 		#--enable=golint \ <== comments on anything exported
 		#--enable=gotype \
-	   	#--enable=unparam \
+		#--enable=unparam \