* Head handlers & Update README.md

Escape quoting chars in filename for gdrive

Allow tls listener only

Add trailing slash if missing on path options

Handle empty upload

make edits in README.md

QR code, html5 player

ISSUE-44 delete support

ISSUE-131 fix mistake with request max memory

GA/UserVoice opt-in

ISSUE-92 added http basic auth handler for upload

refactor bash script without temp files

Timeout reader wrapper actually prevents big upload

ISSUE-109 fragment and query separators not escaped

Update README.md

Add "Windows support" to README

Run standard gofmt command on project root.

- go version go1.10.3 darwin/amd64

Signed-off-by: ia <isaac.ardis@gmail.com>

* GDrive provider support
* More reliable basedir ownership
* Fix mimetype

MAINTAINER is deprecated, using LABEL now

Added a section that explains how to get the `transfer` alias on Windows.

Implement support for custom s3 endpoints

Switch to alpine base image

This drastically decreases the overall image size. Quick comparison:

```
# Image fetched from Docker Hub
dutchcoders/transfer.sh   latest              a875ed5dfa56        5 months ago        704MB
# Image just built
dutchcoders/transfer.sh   latest              a220c49297eb        4 minutes ago       269MB
```

- support for max downloads
- support for expiring downloads