Fix typo in sf-dev yaml

update dockerfile

delete unnecessary folder specification 
heads-up @Robinlovelace and see issue geocompx#435

cleans

returns to the proper settings

Merge pull request geocompx#357 from Robinlovelace/revert-356-copyedi…

…t_c14

Revert "Copyedit c14"

readme update

Demonstrate function creation

Should also fix travis.

@Nowosad and @jannes-m, seem like a good direction of (triangular) travel for c12?

one comments

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Update preface. We're on Phase III now.

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Add sentence emphasising that there are many operations and we'll onl…

…y see some of them.

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