Moved the LLVM and Clang commits to separate files.

Signed-off-by: Dimitar Dobrev <dpldobrev@yahoo.com>

build/Clang-commit

@@ -0,0 +1 @@
+3457cd5516ac741fa106623d9578f5ac88593f4d

build/LLVM-commit

@@ -0,0 +1 @@
+0e8abfa6ed986c892ec723236e32e78fd9c47b88

build/ci/vagrant/ubuntu_x64/Vagrantfile

@@ -52,8 +52,8 @@ Vagrant.configure(2) do |config|
 
   cd llvm/
 
-  #change this hash if u need another version of Llvm
+  llvm_commit=`cat ../../build/LLVM-commit`
-  git reset --hard 0e8abfa6ed986c892ec723236e32e78fd9c47b8 
+  git reset --hard $llvm_commit
 
   cd tools/
 
@@ -61,8 +61,8 @@ Vagrant.configure(2) do |config|
 
   cd clang/
 
-  #change this hash if u need another version of Clang
+  clang_commit=`cat ../../../../build/Clang-commit`
-  git reset --hard 3457cd5516ac741fa106623d9578f5ac88593f4d
+  git reset --hard $clang_commit
 
   mkcd ../../build
 

docs/GettingStarted.md

@@ -20,11 +20,11 @@ Git repository urls found here: [http://llvm.org/docs/GettingStarted.html#git-mi
 3. Clone Clang to `<CppSharp>\deps\llvm\tools\clang`
 4. Create directory `<CppSharp>\deps\llvm\build`
 
-Last revisions known to work:
+Required LLVM/Clang commits:
 
-LLVM `r230176` / Git mirror revision `0e8abfa6ed986c892ec723236e32e78fd9c47b88`.
+[LLVM: see /build/LLVM-commit.](https://github.com/mono/CppSharp/tree/master/build/LLVM-commit)
 
-Clang `r230160` / Git mirror revision `3457cd5516ac741fa106623d9578f5ac88593f4d`.
+[Clang: see /build/Clang-commit.](https://github.com/mono/CppSharp/tree/master/build/Clang-commit)
 
 ## Compiling on Windows/Visual Studio