removed msn section from mlg vignette

This was throwing a warning that I couldn't track
down and It's not terribly informative.

cran-comments.md

@@ -2,7 +2,7 @@
 
 * local OS X install, R 3.3.0
 * ubuntu 12.04 (on travis-ci), devel [2016-06-08 r70732] and R 3.3.0
-* win-builder (devel [2016-06-06 r70718] and release [3.2.4])
+* win-builder (devel [2016-06-08 r70728])
 
 ## R CMD check results
 
@@ -19,34 +19,6 @@ Found the following (possibly) invalid URLs:
     Message: Unauthorized
 ```
 
-### WARNING on win-builder devel:
-
-```
-* checking re-building of vignette outputs ... WARNING
-Error in re-building vignettes:
-  ...
-Loading required package: adegenet
-Loading required package: ade4
-
-   /// adegenet 2.0.1 is loaded ////////////
-
-   > overview: '?adegenet'
-   > tutorials/doc/questions: 'adegenetWeb()' 
-   > bug reports/feature requests: adegenetIssues()
-
-
-This is poppr version 2.1.1.99.67. To get started, type package?poppr
-OMP parallel support: available
-
-This version of poppr is under development.
-If you find any bugs, please report them at https://github.com/grunwaldlab/poppr/issues
-Loading required package: ape
-Quitting from lines 287-295 (mlg.Rmd) 
-Error: processing vignette 'mlg.Rmd' failed with diagnostics:
-invalid gray level, must be in [0,1].
-Execution halted
-```
-
 This is indeed a valid URL
 
 ## Downstream dependencies

vignettes/mlg.Rmd

@@ -278,25 +278,6 @@ Notice that all the MLGs are the same as the originally defined MLGs. Using a
 threshold of zero allows two MLGs separated by zero genetic distance to remain
 mutually unique.
 
-### Minimum spanning networks
-
-Now we have all of our MLLs collapsed together, but perhaps a better way to 
-visualize it would be to use `poppr.msn()`: 
-
-```{r}
-# Threshold of 1
-set.seed(9001)
-g1 <- poppr.msn(x, xdis, threshold = 1, include.ties = TRUE, 
-                vertex.label.color = "firebrick", vertex.label.font = 2)
-# Threshold of 1 + e
-set.seed(9001)
-g2 <- poppr.msn(x, xdis, threshold = 1 + e, include.ties = TRUE, 
-                vertex.label.color = "firebrick", vertex.label.font = 2)
-```
-
-Notice how the genotypes collapse into a single node. Both `poppr.msn()` and
-`bruvo.msn()` will calculate and plot these minimum spanning networks. 
-
 ### Setting the genotypes
 
 As demonstrated at the beginning of this section, if we wanted to reassign our