Test with dplyr 0.6.0 release candidate

[ianmcook]

Test implyr with dplyr version 0.5.0.9002.

[ianmcook]

df158cb builds and checks with no errors or warnings with both dplyr 0.5.0 and the current dplyr 0.6.0 release candidate. I intend to make a few more changes to this version, then release it as version 0.1.1 on CRAN ahead of Hadley's submission of dplyr 0.6.0 to CRAN on or around May 11. The goal with this release is to be compatible with both dplyr 0.5.0 and dplyr 0.6.0, so there is never a current version of implyr on CRAN that fails.

db_desc(), which replaces src_desc(), is currently just a stub. src_desc() in dplyr 0.5.0 dispatches on the src object, but db_desc() in dplyr 0.6.0 dispatches on the connection. This breaks the design I used. The next step is to fix this.

After the dplyr 0.6.0 release, I will make further changes and release a version 0.2.0 that works only with dplyr 0.6.0 and higher. This version 0.2.0 will eliminate some of the messy dplyr/dbplyr conditionals used in 0.1.1.

[ianmcook]

aca1546 fixes the issue with db_desc() described above and builds and checks with no errors or warnings.

[ianmcook]

Change of plans due to feedback from the CRAN team: I will create a version 0.2.0 of implyr that works only with dplyr version 0.6.0 and higher, and submit that to CRAN after dplyr 0.6.0 is on CRAN.

[ianmcook]

e478f88 drops compatibility with dplyr 0.5.0 and builds on the current dplyr 0.6.0 release candidate with no errors, warnings, or notes.

[ianmcook]

As of 3b599b6, the package is compatible with dplyr 0.7.0 (which is the new number for what was going to be 0.6.0). Closing this now, and will submit a version 0.2.0 of implyr to CRAN soon.