RailsConf cleanup and formatting

[marcoroth]

This is a follow-up to #101, I noticed that the RailsConf data files had been missing a few things. I mainly updated and added:

• Added talk titles, where missing or not available from the metadata on YouTube
• Removed event name from talk titles
• Removed speaker names from talk titles
• Fixed consistency in talk titles (Keynote, Workshops, Lightning Talks, etc)
• Fixed typos in talk titles
• Fixed cut-off talk titles
• Added Missing speakers
• Update YAML formatting for better readability
• Enforced Consistent naming on the conference names