Support R syntax highlighting in R("""-blocks (#6)

[Endre Bakken Stovner <notifications@github.com>]

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Uses purcells robust mmm-library: https://github.com/purcell/mmm-mode

Can be further updated to recognize other strings as embedded R. The template should be easy to follow.

I suggest something like `"""[Rr]` for the case where you need to run R-scripts using shell or write them in a variable to print/debug. But I leave it at your discretion.

Use-cases for suggestion above:

```python
        command = """#r
        library(csaw)
        param = readParam(minq=50, restrict=c({chromosomes_as_string}))"""
        print(command)
        R(command)
```

or 

```python
        run_voom_script = """#R
        library(edgeR)
        normfactors = tail(read.table("{input.normalization_file}", row.names=1, header=F), 18)
        colnames(normfactors) = c("norm.factors") # need this name for voom to accept the normfactors
        df = read.table("{input.infile}")

        x = DGEList(counts=df, norm.factors=as.matrix(normfactors))

        y = voom(x)
        write.table(y$E, "{output.outfile}", sep=" ")
        """.format(**locals())

        print(run_voom_script)

        # Must craete new instance of R-interpreter to avoid clashing library requirements
        with open(output.script, "w+") as script_handle:
            script_handle.write(run_voom_script)

        shell("Rscript {output.script}")
```
You can view, comment on, or merge this pull request online at:

  https://github.com/kyleam/snakemake-mode/pull/6

-- Commit Summary --

  * Support R syntax highlighting in R("""-blocks

-- File Changes --

    M snakemake-mode.el (15)

-- Patch Links --

https://github.com/kyleam/snakemake-mode/pull/6.patch
https://github.com/kyleam/snakemake-mode/pull/6.diff

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