use appveyor.yml template (close #37 and #45)

[mrustl]

and start generalising functions (still a lot to clean!)

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This change is 

[mrustl]

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R/helper.R, line 228 at r2 (raw file):

Previously, hsonne (Hauke Sonnenberg) wrote…

> ``` > sprintf( > "############################################################################## > ### Autogenerated with R package %s v%s > ### (installed from '%s' source code on %s) > ### by calling the function %s > ### (file created at: %s) > ##############################################################################\n\n", > meta_creation$package, > meta_creation$ondiskversion, > meta_creation$source, > meta_creation$date, > calling_function_name, > Sys.time() > ``` I do not like multiline strings. Better: ``` fmt <- paste(collapse = "\n", c( "line 1", "line 2", )) sprintf(fmt, ...) ```

Done.

[mrustl]

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R/git_config.R, line 45 at r1 (raw file):

Previously, mrustl (Michael Rustler) wrote…

Is needed for escaping the "@" in roxygen2 (see: https://stackoverflow.com/questions/8809004/escaping-in-roxygen2-style-documentation)

Done.

[mrustl]

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R/git_config.R, line 34 at r1 (raw file):

Previously, mrustl (Michael Rustler) wrote…

Should be Email

Done.

[mrustl]

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R/git_config.R, line 31 at r1 (raw file):

Previously, mrustl (Michael Rustler) wrote…

Ops. Forgot to call the `shell()` function

Done.

[mrustl]

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R/git_config.R, line 10 at r1 (raw file):

Previously, mrustl (Michael Rustler) wrote…

Great idea! :+1:

Done.

[mrustl]

@hsonne I hope that I fixed the git tests now! Stay tuned and check