Add support for slowloading skills

Upgrade msm to 0.7.8

Using the new max_threads parameters to MycroftSkillsManager.apply() the
skill loading is reduced to 2 threads if it's during runtime while a
fast update (20 threads) are used if not all default skills are
installed to speed up getting core into a 100% operational state.

mycroft/skills/skill_manager.py

@@ -161,7 +161,7 @@ class SkillManager(Thread):
         with open(self.installed_skills_file, 'w') as f:
             f.write('\n'.join(skill_names))
 
-    def download_skills(self, speak=False):
+    def download_skills(self, speak=False, quick=False):
         """ Invoke MSM to install default skills and/or update installed skills
 
             Args:
@@ -218,7 +218,11 @@ class SkillManager(Thread):
                         raise
                 installed_skills.add(skill.name)
             try:
-                msm.apply(install_or_update, msm.list())
+                # If defaults are installed
+                defaults = all([s.is_local for s in msm.list_defaults()])
+                num_threads = 20 if not defaults or quick else 2
+                msm.apply(install_or_update, msm.list(),
+                          max_threads=num_threads)
                 if SkillManager.manifest_upload_allowed and is_paired():
                     try:
                         DeviceApi().upload_skills_data(msm.skills_data)

requirements.txt

@@ -24,7 +24,7 @@ google-api-python-client==1.6.4
 fasteners==0.14.1
 PyYAML==3.13
 
-msm==0.7.7
+msm==0.7.8
 msk==0.3.13
 adapt-parser==0.3.3
 padatious==0.4.6