Replaced compiled PHP-AST with package version

Author: andrewholgate

Dockerfile

@@ -10,7 +10,7 @@ RUN DEBIAN_FRONTEND=noninteractive apt-get -y install python-sphinx python-pip d
 
 # XML needed by PHPCodeSniffer 2.3+
 # SQLite needed by Phan
-RUN DEBIAN_FRONTEND=noninteractive apt-get -y install php7.0-xml php7.0-sqlite
+RUN DEBIAN_FRONTEND=noninteractive apt-get -y install php7.0-xml php7.0-sqlite php-ast
 
 # Install XDebug 2.4.0
 RUN wget https://github.com/xdebug/xdebug/archive/XDEBUG_2_4_0.tar.gz && \
@@ -77,17 +77,6 @@ RUN wget https://www.browserstack.com/browserstack-local/BrowserStackLocal-linux
     mv BrowserStackLocal /usr/local/bin/ && \
     rm BrowserStackLocal-linux-x64.zip
 
-# Install AST (for use with Phan)
-RUN git clone https://github.com/nikic/php-ast.git && \
-    cd php-ast && \
-    phpize && \
-    ./configure && \
-    make install && \
-    rm -Rf ../php-ast
-
-COPY ast.ini /etc/php/mods-available/ast.ini
-RUN ln -s /etc/php/mods-available/ast.ini /etc/php/7.0/cli/conf.d/20-ast.ini
-
 # Turn on PHP error reporting
 RUN sed -ri 's/^display_errors\s*=\s*Off/display_errors = On/g' /etc/php/7.0/fpm/php.ini && \
     sed -ri 's/^display_errors\s*=\s*Off/display_errors = On/g' /etc/php/7.0/cli/php.ini  && \