Fixed typos

Summary: Fixed typos

Reviewed By: @scannell

Pulled By: @scannell

Test Plan:
 - php -l and checkModule
 -

README.md

@@ -1,6 +1,6 @@
 # HHVM [![Build Status](https://travis-ci.org/facebook/hhvm.png?branch=master)](https://travis-ci.org/facebook/hhvm)
 
-HHVM (aka the HipHop Virtual Machine) is a new open-source virtual machine designed for executing programs written in PHP. HHVM uses a just-in-time compilation approach to achieve superior performance while maintaining the flexibility that PHP developers are accustomed to. To date, HHVM (and its precedessor HPHPc before it) has realized over a 9x increase in web request throughput and over a 5x reduction in memory consumption for Facebook compared with the Zend PHP 5.2 engine + APC.
+HHVM (aka the HipHop Virtual Machine) is a new open-source virtual machine designed for executing programs written in PHP. HHVM uses a just-in-time compilation approach to achieve superior performance while maintaining the flexibility that PHP developers are accustomed to. To date, HHVM (and its predecessor HPHPc before it) has realized over a 9x increase in web request throughput and over a 5x reduction in memory consumption for Facebook compared with the Zend PHP 5.2 engine + APC.
 
 HHVM can be run as a standalone webserver (i.e. without the Apache webserver and the "modphp" extension). HHVM can also be used together with a FastCGI-based webserver, and work is in progress to make HHVM work smoothly with Apache.
 

configure

@@ -3,7 +3,7 @@
 if [ "$1" = '--help' ] || [ "$1" = '-h' ]; then
 	echo 'usage: ./configure -Dvariable=argument ...\n'
 	echo 'Variables: '
-	echo '  CMAKE_BUILD_TYPE=Debug|Release        Sets build type (default Relase).'
+	echo '  CMAKE_BUILD_TYPE=Debug|Release        Sets build type (default Release).'
 
 	exit 2
 fi

configure_ubuntu_12.04.sh

@@ -1,6 +1,6 @@
 #########################################
 # 
-# Install all the dependancies for HipHop
+# Install all the dependencies for HipHop
 #
 #########################################
 
@@ -22,11 +22,11 @@ fi
 export CMAKE_PREFIX_PATH=`/bin/pwd`/..
 export HPHP_HOME=`/bin/pwd`
 
-# install python-software-properties  before trying to add a PPA
+# install python-software-properties before trying to add a PPA
 sudo apt-get -y update
 sudo apt-get install -y python-software-properties
 
-# install apt-fast to speedup later dependency installation
+# install apt-fast to speed up later dependency installation
 sudo add-apt-repository -y ppa:apt-fast/stable
 sudo apt-get -y update
 sudo apt-get -y install apt-fast