Fix empty reactor summary on newer Maven versions

On newer Maven versions the reactor summary also contains the project name and version so the regexp needs to be adjusted for this.
Also make sure grep treats binary data as text (-aE switch) so the pipe doesn't choke on this.

Signed-off-by: Wouter Born <github@maindrain.net>

.travis.yml

@@ -25,14 +25,14 @@ install:
         done
     }
     function print_reactor_summary() {
-        sed -ne '/\[INFO\] Reactor Summary:/,$ p' "$1" | sed 's/\[INFO\] //'
+        sed -ne '/\[INFO\] Reactor Summary.*:/,$ p' "$1" | sed 's/\[INFO\] //'
     }
     function mvnp() {
         set -o pipefail # exit build with error when pipes fail
         local command=(mvn $@)
         exec "${command[@]}" 2>&1 | # execute, redirect stderr to stdout
             tee .build.log | # write output to log
-            stdbuf -oL grep -E '^\[INFO\] Building .+ \[.+\]$' | # filter progress
+            stdbuf -oL grep -aE '^\[INFO\] Building .+ \[.+\]$' | # filter progress
             sed -uE 's/^\[INFO\] Building (.*[^ ])[ ]+\[([0-9]+\/[0-9]+)\]$/\2| \1/' | # prefix project name with progress
             sed -e :a -e 's/^.\{1,6\}|/ &/;ta' & # right align progress with padding
         local pid=$!