Move conda build and ASV check to cron job
xref #19695 (not closing until pip build test is moved or we decide to keep that here)

https://travis-ci.org/pandas-dev/pandas-ci and http://github.com/pandas-dev/pandas-ci
https://travis-ci.org/pandas-dev/pandas-ci is passing now and set to run daily.

Will merge this once travis passes. # [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19698?src=pr&el=h1) Report
> Merging [#19698](https://codecov.io/gh/pandas-dev/pandas/pull/19698?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/d198a6efd5a3d2e7d5afb4a3cf556507c7501dd4?src=pr&el=desc) will **increase** coverage by `0.02%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/19698/graphs/tree.svg?height=150&width=650&token=eZ4WkYLtcO&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/19698?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #19698      +/-   ##
==========================================
+ Coverage   91.58%    91.6%   +0.02%     
==========================================
  Files         150      150              
  Lines       48867    48867              
==========================================
+ Hits        44755    44767      +12     
+ Misses       4112     4100      -12
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.98% <ø> (+0.02%)` | :arrow_up: |
| #single | `41.75% <ø> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/19698?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/plotting/\_converter.py](https://codecov.io/gh/pandas-dev/pandas/pull/19698/diff?src=pr&el=tree#diff-cGFuZGFzL3Bsb3R0aW5nL19jb252ZXJ0ZXIucHk=) | `66.95% <0%> (+1.73%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19698?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19698?src=pr&el=footer). Last update [d198a6e...b151fd8](https://codecov.io/gh/pandas-dev/pandas/pull/19698?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 FYI, I renamed `3.5_CONDA_BUILD` to `3.5` and removed the `3.6_ASV` job entirely. OK, this is all green other than the pip failure from #19668 (looking further into that later today hopefully) https://travis-ci.org/pandas-dev/pandas/builds/341580276

Thoughts on adding `--skip-network` to the "2.7" build? It's the slowest by ~15 minutes. We'll want to make sure at least one of the 2.7 builds has the flag.

FYI, this weekend I'm planning on revamping some of this stuff into a more declarative YAML form. Then we can have a small script that parses those and prints out which builds have which flags / pinned deps.