implemented first draft version of the progressbar and added hacky example...

implemented first draft version of the progressbar and added hacky example within the widgets example
4 jobs for progressbar_100 in 9 minutes and 46 seconds (queued for 2 seconds)
latest
Status Name Job ID Coverage
  Build
passed build:linux #19787

00:03:48

failed build:redox #19789

00:01:11

passed build:web #19788

00:09:46

 
  Test
skipped test:linux #19790
 
Name Stage Failure
failed
build:redox Build

After determining the correct date, install it with a command such as:

rustup toolchain install nightly-2018-12-27

Then you can use the toolchain with commands such as:

cargo +nightly-2018-12-27 build
ERROR: Job failed: exit code 1