Swap update.sh to still generate for unknown versions and bump to 7.0.0beta1

Also, update generate-stackbrew-library.sh appropriately.

update.sh

@@ -10,8 +10,7 @@ gpgKeys=(
 	[5.3]='0B96609E270F565C13292B24C13C70B87267B52D 0A95E9A026542D53835E3F3A7DEC4E69FC9C83D7'
 )
 # see http://php.net/downloads.php
-alphaVersion="7.0"
-fullAlphaVersion="7.0.0alpha2"
+
 cd "$(dirname "$(readlink -f "$BASH_SOURCE")")"
 
 versions=( "$@" )
@@ -32,15 +31,6 @@ for version in "${versions[@]}"; do
 			break
 		fi
 	done
-	if [ -z "$fullVersion" ]; then
-		echo >&2 "ERROR: missing $version in $packagesUrl"
-		# if version is alpha then we add the missing part 
-		if [ "$alphaVersion" == "$version" ]; then
-			fullVersion="$fullAlphaVersion"
-		else
-			continue
-		fi
-	fi
 	
 	gpgKey="${gpgKeys[$version]}"
 	if [ -z "$gpgKey" ]; then
@@ -48,7 +38,7 @@ for version in "${versions[@]}"; do
 		echo >&2 "  try looking on http://php.net/downloads.php#gpg-$version"
 		exit 1
 	fi
-
+	
 	( set -x; cp docker-php-ext-* "$version/" )
 	
 	for variant in apache fpm; do
@@ -63,6 +53,11 @@ for version in "${versions[@]}"; do
 		( set -x; cp docker-php-ext-* "$version/$variant/" )
 	done
 	
+	if [ -z "$fullVersion" ]; then
+		echo >&2 "ERROR: missing $version in $packagesUrl"
+		continue
+	fi
+	
 	(
 		set -x
 		sed -ri '