Add Travis CI & AppVeyor testing of v0.6, add test badges to README.md

[ScottPJones]

No description provided.

[coveralls]

Changes Unknown when pulling b92175a on ScottPJones:spj/test06 into ** on JuliaDiffEq:master**.

[coveralls]

Changes Unknown when pulling b92175a on ScottPJones:spj/test06 into ** on JuliaDiffEq:master**.

[coveralls]

Changes Unknown when pulling b92175a on ScottPJones:spj/test06 into ** on JuliaDiffEq:master**.

[coveralls]

Changes Unknown when pulling b92175a on ScottPJones:spj/test06 into ** on JuliaDiffEq:master**.

[coveralls]

Changes Unknown when pulling b92175a on ScottPJones:spj/test06 into ** on JuliaDiffEq:master**.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@fffb066). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #1   +/-   ##
=========================================
  Coverage          ?   95.89%           
=========================================
  Files             ?        6           
  Lines             ?     7019           
  Branches          ?        0           
=========================================
  Hits              ?     6731           
  Misses            ?      288           
  Partials          ?        0

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