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You can create new custom tabs to extend Salesforce functionality or to build new application functionality.
Custom Object Tabs look and behave like the standard tabs provided with Salesforce. Web Tabs allow you to embed external web applications and content within the Salesforce window. Visualforce Tabs allow you to embed Visualforce Pages. Lightning Component tabs allow you to add Lightning Components to the navigation menu in Salesforce1. Lightning Page tabs allow you to add Lightning Pages to the navigation menu in Salesforce1.
I want to create a Custom Lightning component tab .
But the feature is missing though it is described in the help section.
I'm following the documtation found at https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/aura_add_cmp_salesforce1.htm , but even with the 'implements="force:appHostable"' set in my aura:component, the Lightning Component isn't available when I try to add a new Lightning Tab.