Bump version of all packages that use knitr for vignettes.

This is because of an issue (now fixed) in knitr which failed to 
create purl()'ed R files from vignette sources and include them in the
package. This version bump will cause these packages to propagate
with those R files included.


git-svn-id: https://hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/ballgown@117323 bc3139a8-67e5-0310-9ffc-ced21a209358

DESCRIPTION

@@ -6,7 +6,7 @@ Authors@R: c(person("Jack", "Fu", role=c("aut"), email="[email protected]"),
     role=c("aut"), email="[email protected]"), person(c("Andrew", "E."),
     "Jaffe", role=c("aut")), person(c("Jeffrey", "T."), "Leek", role=c("aut",
     "ths"), email="[email protected]"))
-Version: 2.5.0
+Version: 2.5.1
 License: Artistic-2.0
 Title: Flexible, isoform-level differential expression analysis
 Description: Tools for statistical analysis of assembled transcriptomes,