Add initial support for PHP7 (#97)

* Add initial support for PHP7

* Update PHP env with now an PSR3 logger (Monolog). Now you can also create a handler function with PSR7 Http message and PSR3 logger in parameter.

* Add examples for PHP7 environement

* For development you can create a function in this path /app/userfuncdev.php it will be loaded

* Switch to alpine base image

* handler now receive an array with request, response and logger object

environments/php7/Dockerfile

@@ -0,0 +1,73 @@
+FROM php:7.1-alpine
+
+ENV PATH="/root/.composer/vendor/bin:${PATH}" \
+    COMPOSER_ALLOW_SUPERUSER=1
+
+RUN echo '#!/bin/sh' > /usr/local/bin/apk-install \
+    && echo 'apk add --update "$@" && rm -rf /var/cache/apk/*' >> /usr/local/bin/apk-install \
+    && chmod +x /usr/local/bin/apk-install
+
+RUN echo 'http://dl-4.alpinelinux.org/alpine/edge/testing' >> /etc/apk/repositories \
+    && apk update \
+    && apk-install \
+    git \
+    curl \
+    curl-dev \
+    libcurl \
+    zlib-dev \
+    freetype-dev \
+    jpeg-dev \
+    libjpeg-turbo-dev \
+    postgresql-dev \
+    libmcrypt-dev \
+    libpng-dev \
+    icu-dev \
+    gettext-dev \
+    vim \
+    libxml2-dev \
+    freetype-dev \
+    unzip \
+    libc6-compat \
+    openssl \
+    gcc \
+    autoconf
+
+RUN docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/
+
+# Install useful extensions
+RUN docker-php-ext-install \
+    opcache \
+    bcmath \
+    ctype \
+    curl \
+    dom \
+    iconv \
+    fileinfo \
+    gd \
+    gettext \
+    intl \
+    json \
+    mcrypt \
+    mysqli \
+    pgsql \
+    pcntl \
+    pdo \
+    ftp \
+    pdo_mysql \
+    pdo_pgsql \
+    phar \
+    simplexml \
+    xmlrpc \
+    zip
+
+RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
+
+COPY . /app
+WORKDIR /app
+
+RUN composer install
+
+EXPOSE 8888
+
+ENTRYPOINT ["php"]
+CMD ["-S","0.0.0.0:8888","index.php"]