Segfault with pd.tslib.get_period_field FIX

[prossahl]

closes #4519

[jreback]

@prossahl
pls do 1 pr per issue
create a new tracking branch off of current master to keep them separate

[jreback]

do

git checkout thisbranch
git checkout -b newbranch
git rebase -i <commit before 1211711>``
git push myfork newbranch

and delete the first 2 commits; this makes this branch independent

[jreback]

don't put this in a separate file, stick in tests/test_tseries.py

[prossahl]

Abandoned. I'll resubmit this.

[cpcloud]

@prossahl should this be closed then?

[prossahl]

@cpcloud Well without the change the segfault can still happen. I'll submit a new pull request as this one pulled in irrelevant changes.

[cpcloud]

you don't need to do that. do this

git reset HEAD~1
git stash
git fetch upstream
git reset --hard upstream/master
git stash pop
git commit -am'Your awesome commit message'
git push --force

[prossahl]

Thanks v. much for your help but its a no go.
git stash results in "No local changes to save". git fetch upstream results in "fatal: 'upstream' does not appear to be a git repository"
I think that my git repo is so messed up it will be quicker to create a new account and start from the beginning...

[cpcloud]

check out this wiki page:

https://github.com/pydata/pandas/wiki/Using-Git

and also pls read this:

https://github.com/pydata/pandas/blob/master/CONTRIBUTING.md