Add bash-syntax highlighting to code blocks.

guides/getting-started-osx.md

@@ -6,42 +6,58 @@
 
 First, create a `$HOME/mygo` directory and its src subdirectory:
 
+```bash
 mkdir -p $HOME/mygo/src # create a place to put source code
+```
 
 Next, set it as the GOPATH. You should also add the bin subdirectory to your PATH environment variable so that you can run the commands therein without specifying their full path. To do this, add the following lines to `$HOME/.profile` (or equivalent):
 
+```bash
 export GOPATH=$HOME/mygo
 export PATH=$PATH:$HOME/mygo/bin
+```
 
 Now you can install Go:
 
+```bash
 brew install go
+```
 
 
 ### Dependencies
 
 Install leveldb and protobuf dependencies:
 
+```bash
 brew install leveldb protobuf
+```
 
 
 ### Libraries
 
+```bash
 go get code.google.com/p/goprotobuf/{proto,protoc-gen-go}
 go get github.com/jmhodges/levigo
 go get code.google.com/p/gorest
 go get github.com/matttproud/{prometheus,golang_instrumentation}
+```
 
 
 ## Build
 
+```bash
 cd ${GOPATH}/src/github.com/matttproud/prometheus
 make build
+```
 
 ## Configure
 
+```bash
 cp prometheus.conf.example prometheus.conf
+```
 
 ## Run
 
+```bash
 ./prometheus
+```