Add 'PAGE_URL' , 'user debugs', 'title should contain', 'number should be present', 'URL should be', 'attribute should contain' steps

What's Changed

• Add 'user sets PAGE_URL environment variable', 'user goes to PAGE_URL' steps by @Marketionist in #53
• Add 'user debugs' step by @Marketionist in #54
• Add 'title should contain' step by @Marketionist in #55
• Add 'number should be present' step by @Marketionist in #56
• Add 'URL should be' step by @Marketionist in #57
• Add 'attribute should contain' step by @Marketionist in #58
• Fix 'user opens in new browser window' step by @Marketionist in #59

Full Changelog: v0.12.0...v1.0.0