Correct back-compatible installer to run in old style with old scripts

[JohnStarich]

Updates back-compatible install script to install the latest 0.1 version 0.1.11 instead of the latest commit on master.

Conveniently, now users can run curl ... | bash -s -- -v MAJOR.MINOR.PATCH to install whichever version they like.

[codecov]

Codecov Report

Merging #179 into master will increase coverage by 1.31%.
The diff coverage is 42.77%.

@@            Coverage Diff             @@
##           master     #179      +/-   ##
==========================================
+ Coverage   41.46%   42.77%   +1.31%     
==========================================
  Files          13        5       -8     
  Lines        1423      879     -544     
==========================================
- Hits          590      376     -214     
+ Misses        714      415     -299     
+ Partials      119       88      -31     

Impacted Files	Coverage Δ
controllers/configmap.go	0.00% <0.00%> (ø)
controllers/secret.go	17.85% <17.85%> (ø)
controllers/binding_controller.go	37.17% <37.17%> (ø)
controllers/service_controller.go	48.71% <48.71%> (ø)
controllers/token_controller.go	74.13% <74.13%> (ø)

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