Test execution fails with:

ERROR: DataArray not defined
 in include at boot.jl:238
 at /home/adrian/.julia/GoogleCharts/src/conveniences.jl:84
 at /home/adrian/.julia/GoogleCharts/src/GoogleCharts.jl:14
 at /home/adrian/.julia/GoogleCharts/test/tests.jl:1

Add "using DataArrays" to conveniences.jl fix it.
Merge pull request #11 from adrianlzt/fix/test_failed_cos_DataArrays

Test execution fails