Extend travis script to test all configurations with device dependent error

Jan Breuer

2016-04-24 bf7f722d0f42b37a83df91d0a62544c948c4cb66

 libscpi/inc/scpi/expression.h

@@ -41,7 +41,7 @@
#ifdef __cplusplus
extern "C" {
#endif
    

    enum _scpi_expr_result_t {
        SCPI_EXPR_OK = 0,
        SCPI_EXPR_ERROR,