readme update
make provider readmes consistent
Merge pull request #40 from lavelle/readme

Update all readmes
initial idea for shared tests
Merge pull request #42 from lavelle/shared-tests

Refactor shared tests out of providers
start work on new icons
remove background from s3 16px
add s3 48 and 128
use 32 and 48 in s3 manifest
webdav 16
webdav 32
webdav manifest
webdav 48 and 128
remove webdav white border
consistent icons for webdav
consistent s3
icon instructions in readme
merge