[Rust] Travis should run tests for Rust library

[asfimport]

We need travis to build the Rust library and run tests so that future PRs do not introduce regressions.

 

PR: #1819

Reporter: Andy Grove / @andygrove
Assignee: Andy Grove / @andygrove

PRs and other links:

• GitHub Pull Request #1819

_{Note: This issue was originally created as ARROW-2376. Please see the migration documentation for further details.}

[asfimport]

Uwe Korn / @xhochy:
Issue resolved by pull request 1819
#1819