Hardcode snap version while a store bug is fixed (#4806)

* Hardcode snap version while a store bug is fixed
This is a workaround for for a failure in the store, which limits the version to 32 characters.
https://forum.snapcraft.io/t/versions-can-be-at-most-32-characters/1642
Capitalize the summary
* add the snapcraft dirs to gitignore bring back settings.json to ignore

.gitignore

@@ -17,3 +17,9 @@ release
 *.syso
 coverage.txt
 settings.json
+.snap
+*.tar.bz2
+parts/
+prime/
+snap/.snapcraft/
+stage/

snap/snapcraft.yaml

@@ -1,6 +1,6 @@
 name: minio
-version: git
-summary: open source object storage server compatible with Amazon S3 APIs
+version: master
+summary: Open source object storage server compatible with Amazon S3 APIs
 description: |
   Minio is an object storage server released under Apache License v2.0. It is
   compatible with Amazon S3 cloud storage service. It is best suited for